$CPT
CAMDEN PROPERTY TRUST Stock $cpt

$cpt Overview Financials Valuation SEC Filings Company Website

2012 Q4 Form 10-K Financial Statement

#000090634513000003 Filed on February 15, 2013

Income Statement

Concept	2012 Q4	2011 Q4	2011 Q3
Revenue	$183.8M	$158.9M	$157.7M
YoY Change	15.68%	3.78%	6.86%
Cost Of Revenue	$70.40M	$56.50M	$72.00M
YoY Change	24.6%	-13.21%	8.76%
Gross Profit	$107.2M	$83.20M	$92.20M
YoY Change	28.85%	-5.45%	13.27%
Gross Profit Margin	58.32%	52.36%	58.46%
Selling, General & Admin	$9.800M	$9.100M	$8.600M
YoY Change	7.69%	-3.19%	13.16%
% of Gross Profit	9.14%	10.94%	9.33%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$53.50M	$45.10M	$44.50M
YoY Change	18.63%	0.0%	2.53%
% of Gross Profit	49.91%	54.21%	48.26%
Operating Expenses	$56.00M	$44.80M	$50.60M
YoY Change	25.0%	-15.47%	5.86%
Operating Profit	$51.20M	$38.40M	$41.60M
YoY Change	33.33%	9.71%	23.81%
Interest Expense	-$10.80M	-$21.20M	$27.35M
YoY Change	-49.06%	-19.39%	-186.84%
% of Operating Profit	-21.09%	-55.21%	65.75%
Other Income/Expense, Net
YoY Change
Pretax Income	$57.60M	$17.30M	$13.57M
YoY Change	232.95%	96.59%	578.3%
Income Tax	$200.0K	$300.0K	$300.0K
% Of Pretax Income	0.35%	1.73%	2.21%
Net Earnings	$142.2M	$46.85M	$11.84M
YoY Change	203.45%	173.98%	596.47%
Net Earnings / Revenue	77.35%	29.49%	7.51%
Basic Earnings Per Share	$1.63	$0.63	$0.16
Diluted Earnings Per Share	$1.60	$0.62	$0.16
COMMON SHARES
Basic Shares Outstanding	84.12M shares		73.24M shares
Diluted Shares Outstanding			74.27M shares

Balance Sheet

Concept	2012 Q4	2011 Q4	2011 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$26.70M	$55.20M	$56.10M
YoY Change	-51.63%	-67.64%	-38.42%
Cash & Equivalents	$26.67M	$55.16M	$56.10M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables	$33.60M	$31.00M	$31.40M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$60.30M	$86.20M	$87.50M
YoY Change	-30.05%	-57.43%	-29.09%
LONG-TERM ASSETS
Property, Plant & Equipment	$5.155B	$4.387B	$4.377B
YoY Change	17.51%	0.73%	1.51%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$45.10M	$44.80M	$37.00M
YoY Change	0.67%	62.32%	11.45%
Other Assets	$36.50M	$32.30M	$22.20M
YoY Change	13.0%	71.81%	-25.5%
Total Long-Term Assets	$5.325B	$4.536B	$4.507B
YoY Change	17.39%	0.86%	0.53%
TOTAL ASSETS
Total Short-Term Assets	$60.30M	$86.20M	$87.50M
Total Long-Term Assets	$5.325B	$4.536B	$4.507B
Total Assets	$5.385B	$4.622B	$4.595B
YoY Change	16.51%	-1.65%	-0.26%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$101.9M	$93.70M	$97.60M
YoY Change	8.75%	14.83%	18.16%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$180.3M	$154.9M	$174.6M
YoY Change	16.4%	11.28%	10.86%
LONG-TERM LIABILITIES
Long-Term Debt	$2.511B	$2.432B	$2.433B
YoY Change	3.22%	-5.14%	-4.29%
Other Long-Term Liabilities	$67.70M	$109.3M	$111.0M
YoY Change	-38.06%	-22.76%	-22.97%
Total Long-Term Liabilities	$2.578B	$2.541B	$2.544B
YoY Change	1.45%	-6.06%	-5.29%
TOTAL LIABILITIES
Total Short-Term Liabilities	$180.3M	$154.9M	$174.6M
Total Long-Term Liabilities	$2.578B	$2.541B	$2.544B
Total Liabilities	$2.758B	$2.696B	$2.886B
YoY Change	2.3%	-10.52%	-4.29%
SHAREHOLDERS EQUITY
Retained Earnings
YoY Change
Common Stock	$3.588B	$2.901B
YoY Change	23.66%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$425.4M	$452.0M
YoY Change	-5.9%
Treasury Stock Shares	11.77M shares	12.51M shares
Shareholders Equity	$2.563B	$1.759B	$1.709B
YoY Change
Total Liabilities & Shareholders Equity	$5.385B	$4.622B	$4.595B
YoY Change	16.51%	-1.65%	-0.26%

Cashflow Statement

Concept	2012 Q4	2011 Q4	2011 Q3
OPERATING ACTIVITIES
Net Income	$142.2M	$46.85M	$11.84M
YoY Change	203.45%	173.98%	596.47%
Depreciation, Depletion And Amortization	$53.50M	$45.10M	$44.50M
YoY Change	18.63%	0.0%	2.53%
Cash From Operating Activities	$74.30M	$44.00M	$86.00M
YoY Change	68.86%	-3.3%	9.55%
INVESTING ACTIVITIES
Capital Expenditures	-$248.1M	-$72.70M	-$87.50M
YoY Change	241.27%	267.17%	446.88%
Acquisitions
YoY Change
Other Investing Activities	$178.9M	$31.50M	-$1.200M
YoY Change	467.94%	-70.0%	-78.57%
Cash From Investing Activities	-$69.30M	-$41.20M	-$88.70M
YoY Change	68.2%	-148.3%	308.76%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	16.00M	-3.800M	-4.400M
YoY Change	-521.05%	-92.59%	-95.31%
NET CHANGE
Cash From Operating Activities	74.30M	44.00M	86.00M
Cash From Investing Activities	-69.30M	-41.20M	-88.70M
Cash From Financing Activities	16.00M	-3.800M	-4.400M
Net Change In Cash	21.00M	-1.000M	-7.100M
YoY Change	-2200.0%	-101.26%	-80.86%
FREE CASH FLOW
Cash From Operating Activities	$74.30M	$44.00M	$86.00M
Capital Expenditures	-$248.1M	-$72.70M	-$87.50M
Free Cash Flow	$322.4M	$116.7M	$173.5M
YoY Change	176.26%	78.71%	83.6%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2011Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	93747000	USD
CY2011Q4	us-gaap	Accounts Receivable Related Parties AccountsReceivableRelatedParties	31035000	USD
CY2012Q4	us-gaap	Accounts Receivable Related Parties AccountsReceivableRelatedParties	33625000	USD
CY2012Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current And Noncurrent AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent	28452000	USD
CY2011Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current And Noncurrent AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent	21883000	USD
CY2011Q4	us-gaap	Accumulated Distributions In Excess Of Net Income AccumulatedDistributionsInExcessOfNetIncome	690466000	USD
CY2012Q4	us-gaap	Accumulated Distributions In Excess Of Net Income AccumulatedDistributionsInExcessOfNetIncome	598951000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-683000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1062000	USD
CY2012Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	3587505000	USD
CY2011Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2901024000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	300000	USD
CY2010	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	500000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	300000	USD
CY2012	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	1400000	USD
CY2011	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	0	USD
CY2010	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	0	USD
CY2011	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	5877000	USD
CY2010	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	4102000	USD
CY2012	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	3608000	USD
CY2010	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1100000	USD
CY2011	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3900000	USD
CY2012	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	13100000	USD
CY2010	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	5100000	shares
CY2011	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	4000000	shares
CY2012	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2300000	shares
CY2012	us-gaap	Asset Management Costs AssetManagementCosts	6631000	USD
CY2011	us-gaap	Asset Management Costs AssetManagementCosts	5935000	USD
CY2010	us-gaap	Asset Management Costs AssetManagementCosts	4841000	USD
CY2011Q4	us-gaap	Assets Assets	4622075000	USD
CY2012Q4	us-gaap	Assets Assets	5385172000	USD
CY2012Q4	us-gaap	Business Acquisition Cost Of Acquired Entity Cash Paid BusinessAcquisitionCostOfAcquiredEntityCashPaid	15900000	USD
CY2012Q1	us-gaap	Business Acquisition Cost Of Acquired Entity Cash Paid BusinessAcquisitionCostOfAcquiredEntityCashPaid	99500000	USD
CY2012Q1	us-gaap	Business Acquisition Percentage Of Voting Interests Acquired BusinessAcquisitionPercentageOfVotingInterestsAcquired	0.80
CY2012Q4	us-gaap	Business Acquisition Percentage Of Voting Interests Acquired BusinessAcquisitionPercentageOfVotingInterestsAcquired	0.50
CY2012Q4	us-gaap	Business Acquisition Purchase Price Allocation Assets Acquired BusinessAcquisitionPurchasePriceAllocationAssetsAcquired	818100000	USD
CY2012Q4	us-gaap	Business Acquisition Purchase Price Allocation Assets Acquired Liabilities Assumed Net BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet	511100000	USD
CY2012Q4	us-gaap	Business Acquisition Purchase Price Allocation Current Assets BusinessAcquisitionPurchasePriceAllocationCurrentAssets	16000000	USD
CY2012Q4	us-gaap	Business Acquisition Purchase Price Allocation Current Assets Cash And Cash Equivalents BusinessAcquisitionPurchasePriceAllocationCurrentAssetsCashAndCashEquivalents	3900000	USD
CY2012Q4	us-gaap	Business Acquisition Purchase Price Allocation Current Liabilities Other Liabilities BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesOtherLiabilities	8200000	USD
CY2012Q4	us-gaap	Business Acquisition Purchase Price Allocation Liabilities Assumed BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumed	307000000	USD
CY2012Q4	us-gaap	Business Acquisition Purchase Price Allocation Notes Payable And Long Term Debt BusinessAcquisitionPurchasePriceAllocationNotesPayableAndLongTermDebt	298800000	USD
CY2012Q4	us-gaap	Business Acquisition Purchase Price Allocation Property Plant And Equipment BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment	622900000	USD
CY2012	us-gaap	Business Combination Pro Forma Information Revenue Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual	52800000	USD
CY2012Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Financial Liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilities	26200000	USD
CY2012Q1	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Financial Liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilities	272600000	USD
CY2012	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain Or Loss BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss	57418000	USD
CY2010	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain Or Loss BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss	0	USD
CY2011	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain Or Loss BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss	0	USD
CY2012Q4	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain Or Loss BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss	17200000	USD
CY2012Q1	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain Or Loss BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss	40200000	USD
CY2012Q4	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain Or Loss BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss	17227000	USD
CY2012Q1	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain Or Loss BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss	40191000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	26669000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	55159000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	170575000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	64156000	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-28490000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-115416000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	106419000	USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.24
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.96
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.80
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	175000000	shares
CY2012Q2	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	175000000	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	87377000	shares
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	99106000	shares
CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	84400000	shares
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	283011000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	30913000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	82154000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	293521000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	38839000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	92736000	USD
CY2012	us-gaap	Conversion Of Stock Amount Issued1 ConversionOfStockAmountIssued1	9143000	USD
CY2010	us-gaap	Conversion Of Stock Amount Issued1 ConversionOfStockAmountIssued1	3536000	USD
CY2011	us-gaap	Conversion Of Stock Amount Issued1 ConversionOfStockAmountIssued1	592000	USD
CY2011	us-gaap	Cost Of Real Estate Revenue CostOfRealEstateRevenue	240128000	USD
CY2010	us-gaap	Cost Of Real Estate Revenue CostOfRealEstateRevenue	226778000	USD
CY2012	us-gaap	Cost Of Real Estate Revenue CostOfRealEstateRevenue	269669000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1581000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1208000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	2220000	USD
CY2012Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	350000000	USD
CY2012Q4	us-gaap	Debt Instrument Interest Rate Effective Percentage DebtInstrumentInterestRateEffectivePercentage	0.0307
CY2012Q4	us-gaap	Debt Instrument Interest Rate Stated Percentage DebtInstrumentInterestRateStatedPercentage	0.0295
CY2012Q4	us-gaap	Debt Weighted Average Interest Rate DebtWeightedAverageInterestRate	0.045
CY2011Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	41000000	USD
CY2012Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	35000000	USD
CY2012Q4	us-gaap	Deferred Tax Liability Not Recognized Cumulative Amount Of Temporary Difference DeferredTaxLiabilityNotRecognizedCumulativeAmountOfTemporaryDifference	0	USD
CY2011Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	-683000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	-1062000	USD
CY2010Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	201000	USD
CY2011Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	-609000	USD
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CY2011	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	609000	USD
CY2012	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	409000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0350
CY2011Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0450
CY2012	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0450
CY2010	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0610
CY2011	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0525
CY2012Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	4040000	USD
CY2011Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	3701000	USD
CY2010Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	2844000	USD
CY2012	us-gaap	Defined Benefit Plan Benefits Paid DefinedBenefitPlanBenefitsPaid	-231000	USD
CY2011	us-gaap	Defined Benefit Plan Benefits Paid DefinedBenefitPlanBenefitsPaid	-220000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	1300000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	200000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	300000	USD
CY2011	us-gaap	Depreciation And Amortization DepreciationAndAmortization	171127000	USD
CY2010	us-gaap	Depreciation And Amortization DepreciationAndAmortization	161760000	USD
CY2012	us-gaap	Depreciation And Amortization DepreciationAndAmortization	203077000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	181791000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	209872000	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	174465000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	300000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	200000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	200000	USD
CY2012	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed For Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear	0.076
CY2012	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	191000	USD
CY2011	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	193000	USD
CY2011	us-gaap	Defined Benefit Plan Plan Amendments DefinedBenefitPlanPlanAmendments	291000	USD
CY2012	us-gaap	Defined Benefit Plan Plan Amendments DefinedBenefitPlanPlanAmendments	0	USD
CY2012	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate DefinedBenefitPlanUltimateHealthCareCostTrendRate	0.045
CY2011	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1800000	USD
CY2012	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2200000	USD
CY2010	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1300000	USD
CY2012Q4	us-gaap	Derivative Assets DerivativeAssets	0	USD
CY2011Q4	us-gaap	Derivative Assets DerivativeAssets	100000	USD
CY2012Q4	us-gaap	Derivative Financial Instruments Liabilities Fair Value Disclosure DerivativeFinancialInstrumentsLiabilitiesFairValueDisclosure	0	USD
CY2011Q4	us-gaap	Derivative Financial Instruments Liabilities Fair Value Disclosure DerivativeFinancialInstrumentsLiabilitiesFairValueDisclosure	16600000	USD
CY2011	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	175000000	USD
CY2012	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	196811000	USD
CY2010	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	163628000	USD
CY2011	us-gaap	Discontinuation Of Cash Flow Hedge DiscontinuationOfCashFlowHedge	29.8
CY2012	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	115068000	USD
CY2011	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	24621000	USD
CY2010	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	9614000	USD
CY2012Q1	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	32541000	USD
CY2011Q4	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	24621000	USD
CY2012Q4	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	82527000	USD
CY2012	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	9495000	USD
CY2011	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	11715000	USD
CY2010	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	14002000	USD
CY2010	us-gaap	Income Tax Reconciliation Deductions Dividends IncomeTaxReconciliationDeductionsDividends	-124999000	USD
CY2012	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	40961000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	16290000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	30608000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	44000000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	53106000	USD
CY2010	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	131008000	USD
CY2011	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	149421000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	14318000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	25304000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	21247000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	22753000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	27802000	USD
CY2012	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	198900000	USD
CY2010Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	35295000	USD
CY2012Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	49969000	USD
CY2011Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	39364000	USD
CY2012Q4	us-gaap	Earnest Money Deposits EarnestMoneyDeposits	2500000	USD
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.33
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.67
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.35
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.63
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.10
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.16
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.26
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.36
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.23
CY2011Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.63
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.10
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.66
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.33
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.30
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.35
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.16
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.60
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.23
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.26
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.07
CY2010	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	10565000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-8205000	USD
CY2012	us-gaap	Income Taxes Paid IncomeTaxesPaid	1561000	USD
CY2011Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.62
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.10
CY2011	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	900000	USD
CY2010	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1000000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1400000	USD
CY2011	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	5329000	USD
CY2010	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	6524000	USD
CY2012	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	6321000	USD
CY2011Q4	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	0.20
CY2011	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	1136000	USD
CY2012	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	0	USD
CY2010	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	0	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	1394900000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	917800000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Equity Or Capital EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital	165200000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Equity Or Capital EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital	261600000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities EquityMethodInvestmentSummarizedFinancialInformationLiabilities	712700000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities EquityMethodInvestmentSummarizedFinancialInformationLiabilities	1093900000	USD
CY2010	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	-19100000	USD
CY2012	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	50500000	USD
CY2011	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	-3200000	USD
CY2012	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	131900000	USD
CY2011	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	126600000	USD
CY2010	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	102900000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Asset Acquired In Place Leases FiniteLivedIntangibleAssetAcquiredInPlaceLeases	2600000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Asset Acquired In Place Leases FiniteLivedIntangibleAssetAcquiredInPlaceLeases	0	USD
CY2011	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	4301000	USD
CY2012	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	0	USD
CY2010	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	0	USD
CY2012	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	0	USD
CY2010	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	236000	USD
CY2011	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	4748000	USD
CY2011Q2	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	4748000	USD
CY2012	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	37528000	USD
CY2010	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	30762000	USD
CY2011	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	35456000	USD
CY2012Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	0	USD
CY2010Q4	us-gaap	Impairment Of Investments ImpairmentOfInvestments	1000000	USD
CY2011	us-gaap	Increase Decrease In Property And Other Taxes Payable IncreaseDecreaseInPropertyAndOtherTaxesPayable	-122000	USD
CY2010	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-295000	USD
CY2011	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	13172000	USD
CY2012	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	161665000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	25845000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	9107000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	170545000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	7526000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	23625000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	169337000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.17
CY2010	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.01
CY2012	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.90
CY2011	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.17
CY2010	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.01
CY2012	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.88
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	23616000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	36336000	USD
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	124563000	USD
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	105000	USD
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	2838000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	129000	USD
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	121725000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	36207000	USD
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	23511000	USD
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	1.45
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.50
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.34
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	1.42
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.34
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.49
CY2010	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-839000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	5679000	USD
CY2012	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	20175000	USD
CY2012	us-gaap	Income Tax Reconciliation Deductions Dividends IncomeTaxReconciliationDeductionsDividends	-224339000	USD
CY2011	us-gaap	Income Tax Reconciliation Deductions Dividends IncomeTaxReconciliationDeductionsDividends	-143657000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	895000	USD
CY2011	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	9469000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	4188000	USD
CY2011	us-gaap	Income Taxes Paid IncomeTaxesPaid	2664000	USD
CY2010	us-gaap	Income Taxes Paid IncomeTaxesPaid	1169000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	2209000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	2320000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	2026000	USD
CY2010	us-gaap	Increase Decrease In Accounts Receivable Related Parties IncreaseDecreaseInAccountsReceivableRelatedParties	-4217000	USD
CY2012	us-gaap	Increase Decrease In Accounts Receivable Related Parties IncreaseDecreaseInAccountsReceivableRelatedParties	2586000	USD
CY2011	us-gaap	Increase Decrease In Accounts Receivable Related Parties IncreaseDecreaseInAccountsReceivableRelatedParties	-860000	USD
CY2010	us-gaap	Increase Decrease In Notes Receivable Related Parties IncreaseDecreaseInNotesReceivableRelatedParties	-637000	USD
CY2011	us-gaap	Increase Decrease In Notes Receivable Related Parties IncreaseDecreaseInNotesReceivableRelatedParties	-3279000	USD
CY2012	us-gaap	Increase Decrease In Notes Receivable Related Parties IncreaseDecreaseInNotesReceivableRelatedParties	0	USD
CY2012	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	9859000	USD
CY2010	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	-4508000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	2443000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-5183000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-596000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-816000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-275000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-16192000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-17152000	USD
CY2010	us-gaap	Increase Decrease In Property And Other Taxes Payable IncreaseDecreaseInPropertyAndOtherTaxesPayable	-1269000	USD
CY2012	us-gaap	Increase Decrease In Property And Other Taxes Payable IncreaseDecreaseInPropertyAndOtherTaxesPayable	5640000	USD
CY2011	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	0	shares
CY2010	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	0	shares
CY2012	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	1137000	shares
CY2012	us-gaap	Interest And Other Income InterestAndOtherIncome	-710000	USD
CY2011	us-gaap	Interest And Other Income InterestAndOtherIncome	4649000	USD
CY2010	us-gaap	Interest And Other Income InterestAndOtherIncome	8584000	USD
CY2011	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	8800000	USD
CY2012	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	12500000	USD
CY2010	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	5700000	USD
CY2012	us-gaap	Interest Expense InterestExpense	104282000	USD
CY2011	us-gaap	Interest Expense InterestExpense	112414000	USD
CY2010	us-gaap	Interest Expense InterestExpense	125893000	USD
CY2011	us-gaap	Interest Paid Net InterestPaidNet	114615000	USD
CY2010	us-gaap	Interest Paid Net InterestPaidNet	128742000	USD
CY2012	us-gaap	Interest Paid Net InterestPaidNet	106405000	USD
CY2011Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	4751654000	USD
CY2012Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	5389674000	USD
CY2011Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	44844000	USD
CY2012Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	45092000	USD
CY2012Q4	us-gaap	Land Land	949777000	USD
CY2011Q4	us-gaap	Land Land	768016000	USD
CY2012	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	2900000	USD
CY2012Q3	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	2600000	USD
CY2011Q3	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	2800000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	2758464000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	2696382000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4622075000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5385172000	USD
CY2011	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	0	USD
CY2010	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	3197000	USD
CY2012	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	6976000	USD
CY2012Q4	us-gaap	Long Term Debt LongTermDebt	2510500000	USD
CY2011	us-gaap	Loss On Discontinuation Of Cash Flow Hedge Due To Forecasted Transaction Probable Of Not Occurring LossOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurring	29791000	USD
CY2012	us-gaap	Loss On Discontinuation Of Cash Flow Hedge Due To Forecasted Transaction Probable Of Not Occurring LossOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurring	0	USD
CY2010	us-gaap	Loss On Discontinuation Of Cash Flow Hedge Due To Forecasted Transaction Probable Of Not Occurring LossOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurring	0	USD
CY2011Q2	us-gaap	Loss On Discontinuation Of Cash Flow Hedge Due To Forecasted Transaction Probable Of Not Occurring LossOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurring	29791000	USD
CY2010	us-gaap	Management Fees Revenue ManagementFeesRevenue	8172000	USD
CY2012	us-gaap	Management Fees Revenue ManagementFeesRevenue	12345000	USD
CY2011	us-gaap	Management Fees Revenue ManagementFeesRevenue	9973000	USD
CY2011Q4	us-gaap	Minority Interest MinorityInterest	69051000	USD
CY2012Q4	us-gaap	Minority Interest MinorityInterest	63609000	USD
CY2012	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	-16482000	USD
CY2012	us-gaap	Nature Of Operations NatureOfOperations	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">1. Description of Business</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Business.</font><font style="font-family:inherit;font-size:10pt;"> Formed on May 25, 1993, Camden Property Trust, a Texas real estate investment trust (“REIT”), is primarily engaged in the ownership, management, development, acquisition, and construction of multifamily apartment communities. Our multifamily apartment communities are referred to as “communities,” “multifamily communities,” “properties,” or “multifamily properties” in the following discussion. As of </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">December 31, 2012</font><font style="font-family:inherit;font-size:10pt;">, we owned interests in, operated, or were developing </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">202</font><font style="font-family:inherit;font-size:10pt;"> multifamily properties comprising </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">68,620</font><font style="font-family:inherit;font-size:10pt;"> apartment homes across the United States. Of these </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">202</font><font style="font-family:inherit;font-size:10pt;"> properties, </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">nine</font><font style="font-family:inherit;font-size:10pt;"> properties were under development and when completed will consist of a total of </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">2,845</font><font style="font-family:inherit;font-size:10pt;"> apartment homes. In addition, we own land parcels we may develop into multifamily apartment communities in the future.</font></div></div>
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-152767000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-172886000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	174928000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	35150000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-527685000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-187364000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	224036000	USD
CY2011	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	0	USD
CY2012	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	16482000	USD
CY2010	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	0	USD
CY2012Q4	us-gaap	Notes Payable NotesPayable	2510500000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	324267000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	244834000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	283390000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	49379000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	23216000	USD
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	21763000	USD
CY2011Q4	us-gaap	Net Income Loss NetIncomeLoss	46850000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	11840000	USD
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	-16597000	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	30703000	USD
CY2012Q4	us-gaap	Net Income Loss NetIncomeLoss	142166000	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	88758000	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	7286000	USD
CY2011	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3453000	USD
CY2010	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	821000	USD
CY2012	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	4821000	USD
CY2011	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	7000000	USD
CY2010	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	7000000	USD
CY2012	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	776000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	22951000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	48828000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	280606000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	22951000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	282590000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	48828000	USD
CY2011	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	0	USD
CY2010	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	238885000	USD
CY2012	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	0	USD
CY2011	us-gaap	Noncash Or Part Noncash Acquisition Intangible Assets Acquired1 NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1	0	USD
CY2010	us-gaap	Noncash Or Part Noncash Acquisition Intangible Assets Acquired1 NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1	4962000	USD
CY2012	us-gaap	Noncash Or Part Noncash Acquisition Intangible Assets Acquired1 NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1	0	USD
CY2010	us-gaap	Noncash Or Part Noncash Acquisition Other Assets Acquired1 NoncashOrPartNoncashAcquisitionOtherAssetsAcquired1	1135000	USD
CY2012	us-gaap	Noncash Or Part Noncash Acquisition Other Assets Acquired1 NoncashOrPartNoncashAcquisitionOtherAssetsAcquired1	0	USD
CY2011	us-gaap	Noncash Or Part Noncash Acquisition Other Assets Acquired1 NoncashOrPartNoncashAcquisitionOtherAssetsAcquired1	0	USD
CY2011Q2	us-gaap	Notional Amount Of Interest Rate Derivatives NotionalAmountOfInterestRateDerivatives	500000000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	2500000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	300000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	400000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	1500000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	2400000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	600000	USD
CY2011	us-gaap	Payments To Acquire Interest In Joint Venture PaymentsToAcquireInterestInJointVenture	46037000	USD
CY2012	us-gaap	Payments To Acquire Interest In Joint Venture PaymentsToAcquireInterestInJointVenture	7006000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	3306000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	0	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	0	USD
CY2011Q4	us-gaap	Other Liabilities OtherLiabilities	109276000	USD
CY2012Q4	us-gaap	Other Liabilities OtherLiabilities	67679000	USD
CY2011	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	87137000	USD
CY2010	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	79177000	USD
CY2012	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	101781000	USD
CY2012	us-gaap	Owned Property Management Costs OwnedPropertyManagementCosts	21796000	USD
CY2011	us-gaap	Owned Property Management Costs OwnedPropertyManagementCosts	20686000	USD
CY2010	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	488895000	USD
CY2012	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	626127000	USD
CY2011	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	533937000	USD
CY2012Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	30200000	USD
CY2012Q4	us-gaap	Other Assets OtherAssets	88260000	USD
CY2011Q4	us-gaap	Other Assets OtherAssets	88089000	USD
CY2012	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Cost Credit Arising During Period Before Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax	0	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Cost Credit Arising During Period Before Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax	-291000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Net Prior Service Cost Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostRecognizedInNetPeriodicBenefitCostBeforeTax	30000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Net Prior Service Cost Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostRecognizedInNetPeriodicBenefitCostBeforeTax	16000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	7697000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	32775000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-379000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-65000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	884000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	409000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	39657000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	23385000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	0	USD
CY2011	us-gaap	Other Comprehensive Income Loss Transfers From Held To Maturity To Available For Sale Securities Net Of Tax OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax	-3306000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Transfers From Held To Maturity To Available For Sale Securities Net Of Tax OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax	0	USD
CY2012	us-gaap	Other Comprehensive Income Loss Transfers From Held To Maturity To Available For Sale Securities Net Of Tax OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax	0	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-19059000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	0	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-2692000	USD
CY2010	us-gaap	Owned Property Management Costs OwnedPropertyManagementCosts	19982000	USD
CY2012	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	8837000	USD
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1872000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	3988000	USD
CY2012	us-gaap	Payments Of Dividends PaymentsOfDividends	189018000	USD
CY2010	us-gaap	Payments Of Dividends PaymentsOfDividends	135626000	USD
CY2011	us-gaap	Payments Of Dividends PaymentsOfDividends	152242000	USD
CY2011	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	9288000	USD
CY2012	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	3737000	USD
CY2010	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	6564000	USD
CY2010	us-gaap	Payments To Acquire Interest In Joint Venture PaymentsToAcquireInterestInJointVenture	6467000	USD
CY2012	us-gaap	Payments To Acquire Land PaymentsToAcquireLand	33600000	USD
CY2011	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	0	USD
CY2010	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	0	USD
CY2012	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	465400000	USD
CY2010	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	63739000	USD
CY2011	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	227755000	USD
CY2012	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	290728000	USD
CY2012Q2	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	10000000	shares
CY2010	us-gaap	Proceeds From Distributions Received From Real Estate Partnerships ProceedsFromDistributionsReceivedFromRealEstatePartnerships	28000	USD
CY2012	us-gaap	Proceeds From Distributions Received From Real Estate Partnerships ProceedsFromDistributionsReceivedFromRealEstatePartnerships	17417000	USD
CY2011	us-gaap	Proceeds From Distributions Received From Real Estate Partnerships ProceedsFromDistributionsReceivedFromRealEstatePartnerships	6005000	USD
CY2012	us-gaap	Proceeds From Divestiture Of Interest In Joint Venture ProceedsFromDivestitureOfInterestInJointVenture	0	USD
CY2011	us-gaap	Proceeds From Divestiture Of Interest In Joint Venture ProceedsFromDivestitureOfInterestInJointVenture	19310000	USD
CY2010	us-gaap	Proceeds From Divestiture Of Interest In Joint Venture ProceedsFromDivestitureOfInterestInJointVenture	0	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	693355000	USD
CY2010	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	231651000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	106571000	USD
CY2010	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	14401000	USD
CY2012	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	20933000	USD
CY2011	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	18629000	USD
CY2012	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	603000000	USD
CY2011	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	8000000	USD
CY2010	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	37000000	USD
CY2010	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	57748000	USD
CY2012	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	346308000	USD
CY2011	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	495705000	USD
CY2012	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	1625000	USD
CY2011	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	1734000	USD
CY2010	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	1064000	USD
CY2012	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	0	USD
CY2010	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	0	USD
CY2011	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	4510000	USD
CY2012	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	226869000	USD
CY2011	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	57312000	USD
CY2010	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	102819000	USD
CY2010	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1435000	USD
CY2011	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	11397000	USD
CY2012	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	13038000	USD
CY2012	us-gaap	Profit Loss ProfitLoss	293900000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	31142000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	59961000	USD
CY2011Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1432799000	USD
CY2009Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1149056000	USD
CY2012Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1518896000	USD
CY2010Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1292924000	USD
CY2011	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	171009000	USD
CY2012	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	185546000	USD
CY2010	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	166867000	USD
CY2010	us-gaap	Real Estate Accumulated Depreciation Other Deductions RealEstateAccumulatedDepreciationOtherDeductions	0	USD
CY2011	us-gaap	Real Estate Accumulated Depreciation Other Deductions RealEstateAccumulatedDepreciationOtherDeductions	-12257000	USD
CY2012	us-gaap	Real Estate Accumulated Depreciation Other Deductions RealEstateAccumulatedDepreciationOtherDeductions	-26984000	USD
CY2010	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	-22999000	USD
CY2011	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	-18877000	USD
CY2012	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	-72465000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Accumulated Depreciation RealEstateAndAccumulatedDepreciationAccumulatedDepreciation	1518896000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	972256000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements	5724137000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land RealEstateAndAccumulatedDepreciationCarryingAmountOfLand	949777000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfLandAndBuildingsAndImprovements	6673914000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements	482583000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements	5241554000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Land RealEstateAndAccumulatedDepreciationInitialCostOfLand	949777000	USD
CY2012	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	-176872000	USD
CY2010	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	-119037000	USD
CY2011	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	-32673000	USD
CY2012Q4	us-gaap	Real Estate Federal Income Tax Basis RealEstateFederalIncomeTaxBasis	5900000000	USD
CY2010Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	5647677000	USD
CY2011Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	5819540000	USD
CY2009Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	5461626000	USD
CY2012Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	6673914000	USD
CY2011Q4	us-gaap	Real Estate Heldforsale RealEstateHeldforsale	11131000	USD
CY2012Q4	us-gaap	Real Estate Heldforsale RealEstateHeldforsale	30517000	USD
CY2011	us-gaap	Real Estate Improvements RealEstateImprovements	61037000	USD
CY2010	us-gaap	Real Estate Improvements RealEstateImprovements	44405000	USD
CY2012	us-gaap	Real Estate Improvements RealEstateImprovements	60426000	USD
CY2011Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	1432799000	USD
CY2012Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	1518896000	USD
CY2011	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	0	USD
CY2012	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	797477000	USD
CY2010	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	238885000	USD
CY2012	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	727908000	USD
CY2010	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	568072000	USD
CY2011	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	621074000	USD
CY2011Q4	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	158888000	USD
CY2011Q3	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	157728000	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Period Increase Decrease ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPeriodIncreaseDecrease	77249	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Period Increase Decrease ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPeriodIncreaseDecrease	146352	shares
CY2011Q4	us-gaap	Secured Debt SecuredDebt	1051357000	USD
CY2012Q4	us-gaap	Secured Debt SecuredDebt	972256000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	12039000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	11306000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	13086000	USD
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	-20279	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	-25961	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	-11386	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	52.05
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	39.64
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	44.51
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	372661	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	347084	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	346330	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	57.00
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	40.05
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	63.51
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	862253	shares
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	595153	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	818754	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	741505	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	52.64
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	42.16
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	46.88
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	46.20
CY2012Q4	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	191432000	USD
CY2012Q1	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	170954000	USD
CY2011Q2	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	153992000	USD
CY2012Q2	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	178212000	USD
CY2011Q1	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	150466000	USD
CY2012Q3	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	187310000	USD
CY2012	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	72858000	USD
CY2011	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	65128000	USD
CY2010	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	63150000	USD
CY2011	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	8000000	USD
CY2010	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	37000000	USD
CY2012	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	603000000	USD
CY2012	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	567575000	USD
CY2010	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	306692000	USD
CY2011	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	627623000	USD
CY2011Q2	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	500000000	USD
CY2011Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	5076000	USD
CY2012Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	5991000	USD
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Period Increase Decrease ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPeriodIncreaseDecrease	43499	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	-214923	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	-282552	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	-243874	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	49.28
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	47.19
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	49.17
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum	0.392
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum	0.356
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum	0.037
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum	0.036
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	-50904	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	-2762	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	-31943	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	55895	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	0
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	21800000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Period Increase Decrease ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingPeriodIncreaseDecrease	-136222	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Period Increase Decrease ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingPeriodIncreaseDecrease	-500782	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Period Increase Decrease ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingPeriodIncreaseDecrease	-507600	shares
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	40.86
CY2011	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	42.59
CY2010	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	32.54
CY2011	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	48.02
CY2010	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	46.65
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	60.56
CY2010	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	43.94
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0.00
CY2011	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0.00
CY2012Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions	551206	shares
CY2010Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	1847136	shares
CY2012Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	838754	shares
CY2009Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	1983358	shares
CY2011Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	1339536	shares
CY2012Q2	us-gaap	Share Price SharePrice	67.67
CY2012Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	12400000	USD
CY2011	us-gaap	Stock Issued During Period Shares Conversion Of Units StockIssuedDuringPeriodSharesConversionOfUnits	66	shares
CY2012	us-gaap	Stock Issued During Period Shares Conversion Of Units StockIssuedDuringPeriodSharesConversionOfUnits	558	shares
CY2010	us-gaap	Stock Issued During Period Shares Conversion Of Units StockIssuedDuringPeriodSharesConversionOfUnits	279	shares
CY2013Q1	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	4985	shares
CY2010	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	29100	shares
CY2012	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	20137	shares
CY2011	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	19914	shares
CY2011	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	1751	shares
CY2012	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	11192	shares
CY2010	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	4868	shares
CY2011	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	-504838	shares
CY2010	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	-141213	shares
CY2012	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	-468839	shares
CY2011	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits		USD
CY2010	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	-25000	USD
CY2012	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	-149000	USD
CY2011	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1780000	USD
CY2010	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1165000	USD
CY2012	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1334000	USD
CY2010	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	231651000	USD
CY2011	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	106571000	USD
CY2012	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	693355000	USD
CY2011	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	13407000	USD
CY2010	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	11613000	USD
CY2012	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	15146000	USD
CY2011	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	12322000	USD
CY2010	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2997000	USD
CY2012	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	13966000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	2563099000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	1758717000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2626708000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1827768000	USD
CY2009Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1609013000	USD
CY2010Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1757373000	USD
CY2010	us-gaap	Stockholders Equity Other StockholdersEquityOther	-27000	USD
CY2010Q4	us-gaap	Temporary Equity Carrying Amount Attributable To Noncontrolling Interest TemporaryEquityCarryingAmountAttributableToNoncontrollingInterest	97925000	USD
CY2009Q4	us-gaap	Temporary Equity Carrying Amount Attributable To Noncontrolling Interest TemporaryEquityCarryingAmountAttributableToNoncontrollingInterest	97925000	USD
CY2011Q4	us-gaap	Temporary Equity Carrying Amount Attributable To Noncontrolling Interest TemporaryEquityCarryingAmountAttributableToNoncontrollingInterest	97925000	USD
CY2012Q4	us-gaap	Temporary Equity Carrying Amount Attributable To Noncontrolling Interest TemporaryEquityCarryingAmountAttributableToNoncontrollingInterest	0	USD
CY2011	us-gaap	Transfer Mortgage Payable TransferMortgagePayable	0	USD
CY2012	us-gaap	Transfer Mortgage Payable TransferMortgagePayable	298807000	USD
CY2010	us-gaap	Transfer Mortgage Payable TransferMortgagePayable	188119000	USD
CY2012Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	11771000	shares
CY2011Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	12509000	shares
CY2011Q4	us-gaap	Treasury Stock Value TreasuryStockValue	452003000	USD
CY2012Q4	us-gaap	Treasury Stock Value TreasuryStockValue	425355000	USD
CY2010	us-gaap	Undistributed Earnings Allocated To Participating Securities UndistributedEarningsAllocatedToParticipatingSecurities	265000	USD
CY2011	us-gaap	Undistributed Earnings Allocated To Participating Securities UndistributedEarningsAllocatedToParticipatingSecurities	551000	USD
CY2012	us-gaap	Undistributed Earnings Allocated To Participating Securities UndistributedEarningsAllocatedToParticipatingSecurities	2784000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2011	cpt	Change In Fair Value Of Available For Sale Investments Net Of Tax ChangeInFairValueOfAvailableForSaleInvestmentsNetOfTax	0	USD
CY2012	cpt	Change In Fair Value Of Available For Sale Investments Net Of Tax ChangeInFairValueOfAvailableForSaleInvestmentsNetOfTax	0	USD
CY2010	cpt	Change In Fair Value Of Available For Sale Investments Net Of Tax ChangeInFairValueOfAvailableForSaleInvestmentsNetOfTax	3306000	USD
CY2011	cpt	Classifcation To Held For Sale ClassifcationToHeldForSale	-23951000	USD
CY2010	cpt	Classifcation To Held For Sale ClassifcationToHeldForSale	0	USD
CY2012	cpt	Classifcation To Held For Sale ClassifcationToHeldForSale	-58953000	USD
CY2012Q4	cpt	Closing Share Price Per Share For Calculation Of Aggregate Intrinsic Values ClosingSharePricePerShareForCalculationOfAggregateIntrinsicValues	68.21
CY2010	cpt	Common Share Options And Share Awards Granted CommonShareOptionsAndShareAwardsGranted	0	shares
CY2011	cpt	Common Share Options And Share Awards Granted CommonShareOptionsAndShareAwardsGranted	706000	shares
CY2012	cpt	Common Share Options And Share Awards Granted CommonShareOptionsAndShareAwardsGranted	647000	shares
CY2012Q4	us-gaap	Unsecured Debt UnsecuredDebt	1538212000	USD
CY2011Q4	us-gaap	Unsecured Debt UnsecuredDebt	1380755000	USD
CY2012	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Use of Estimates</font><font style="font-family:inherit;font-size:10pt;">. In the application of GAAP, management is required to make estimates and assumptions which affect the reported amounts of assets and liabilities at the date of the financial statements, results of operations during the reporting periods, and related disclosures. Our more significant estimates include estimates supporting our impairment analysis related to the carrying values of our real estate assets, and estimates related to the valuation of our investments in joint ventures. These estimates are based on historical experience and other assumptions believed to be reasonable under the circumstances. Future events rarely develop exactly as forecasted, and the best estimates routinely require adjustment.</font></div></div>
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	85556000	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	68608000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	73462000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	68608000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	83772000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	72756000	shares
CY2012	cpt	Accrual Associated With Construction And Capital Expenditures AccrualAssociatedWithConstructionAndCapitalExpenditures	18993000	USD
CY2011	cpt	Accrual Associated With Construction And Capital Expenditures AccrualAssociatedWithConstructionAndCapitalExpenditures	16754000	USD
CY2010	cpt	Accrual Associated With Construction And Capital Expenditures AccrualAssociatedWithConstructionAndCapitalExpenditures	6590000	USD
CY2012	cpt	Acres Of Land Acquired AcresOfLandAcquired	22.6	acre
CY2012	cpt	Annual Dividend Distribution Percentage To Shareholders To Qualify As Real Estate Investment Trust AnnualDividendDistributionPercentageToShareholdersToQualifyAsRealEstateInvestmentTrust	0.90
CY2012Q4	cpt	Anticipated Expenditures Relating To Completion Of Construction Type Contracts AnticipatedExpendituresRelatingToCompletionOfConstructionTypeContracts	353900000	USD
CY2012	cpt	Basis Of Presentation Summary Of Significant Accounting Policies And Recent Accounting Pronouncements BasisOfPresentationSummaryOfSignificantAccountingPoliciesAndRecentAccountingPronouncements	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">2. Summary of Significant Accounting Policies and Recent Accounting Pronouncements</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Principles of Consolidation</font><font style="font-family:inherit;font-size:10pt;">. Our consolidated financial statements include our accounts and the accounts of other subsidiaries and joint ventures (including partnerships and limited liability companies) over which we have control. All intercompany transactions, balances, and profits have been eliminated in consolidation. Investments acquired or created are continuously evaluated based on the accounting guidance relating to variable interest entities (“VIEs”), which requires the consolidation of VIEs in which we are considered to be the primary beneficiary. If the investment is determined not to be a VIE, then the investment is evaluated for consolidation (primarily using a voting interest model) under the remaining consolidation guidance relating to real estate entities. If we are the general partner of a limited partnership, or manager of a limited liability company, we also consider the consolidation guidance relating to the rights of limited partners (non-managing members) to assess whether any rights held by the limited partners overcome the presumption of control by us.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Allocations of Purchase Price</font><font style="font-family:inherit;font-size:10pt;">. Upon acquisition of real estate, we allocate the fair value between tangible and intangible assets, which includes land, buildings (as-if-vacant), furniture and fixtures, the value of in-place leases, including above and below market leases, and acquired liabilities. In allocating these values, we apply methods similar to those used by independent appraisers of income-producing property. Upon the acquisition of a controlling interest of an investment in an unconsolidated joint venture, such joint venture is consolidated and our initial equity investment is remeasured to fair value at the date the controlling interest is acquired; any difference between the carrying value of the previously held equity investment is recognized in earnings at the time of obtaining control. Transaction costs associated with the acquisition of operating real estate assets are expensed. Depreciation is computed on a straight-line basis over the remaining useful lives of the related tangible assets. The value of in-place leases and above or below market leases is amortized over the estimated average remaining life of leases in place at the time of acquisition. The unamortized value of in-place leases and the unamortized value of above or below market leases at </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">December 31, 2012</font><font style="font-family:inherit;font-size:10pt;"> was approximately </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">$2.6 million</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">$0.7 million</font><font style="font-family:inherit;font-size:10pt;">, respectively, and are included in other assets and other liabilities in our condensed consolidated balance sheet, respectively. There was </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">no</font><font style="font-family:inherit;font-size:10pt;"> unamortized value of in-place leases or above or below market leases at </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">December 31, 2011</font><font style="font-family:inherit;font-size:10pt;">. Amortization expense related to the value of in-place leases for the years ended December 31, 2012, 2011 and 2010 was approximately </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">$13.1 million</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">$3.9 million</font><font style="font-family:inherit;font-size:10pt;">, and </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">$1.1 million</font><font style="font-family:inherit;font-size:10pt;">, respectively. We recognized approximately </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">$1.4 million</font><font style="font-family:inherit;font-size:10pt;"> of revenues related to the value of above or below market leases during the year ended </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">December 31, 2012</font><font style="font-family:inherit;font-size:10pt;">. There were </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">no</font><font style="font-family:inherit;font-size:10pt;"> revenues related to the value of above or below market leases recognized during the years ended </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">December 31, 2011</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">2010</font><font style="font-family:inherit;font-size:10pt;">. Estimates of fair value of acquired debt are based upon interest rates available for the issuance of debt with similar terms and remaining maturities.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Asset Impairment</font><font style="font-family:inherit;font-size:10pt;">. Long-lived assets are reviewed for impairment annually or whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. Impairment exists if estimated future undiscounted cash flows associated with long-lived assets are not sufficient to recover the carrying value of such assets. We consider projected future discounted and undiscounted cash flows, trends, strategic decisions regarding future development plans, and other factors in our assessment of whether impairment conditions exist. When impairment exists, the long-lived asset is adjusted to its fair value. While we believe our estimates of future cash flows are reasonable, different assumptions regarding a number of factors, including market rents, economic conditions, and occupancies could significantly affect these estimates. In estimating fair value, management uses appraisals, management estimates, and discounted cash flow calculations which maximize inputs from a marketplace participant’s perspective.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In addition, we evaluate our equity investments in joint ventures and if we believe there is an other than temporary decline in market value of our investment below our carrying value, we will record an impairment charge.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The value of our properties under development depends on market conditions, including estimates of the project start date as well as estimates of demand for multifamily communities. We have reviewed market trends and other marketplace information and have incorporated this information as well as our current outlook into the assumptions we use in our impairment analyses. Due to the judgment and assumptions applied in the impairment analyses, it is possible actual results could differ substantially from those estimated.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We believe the carrying value of our operating real estate assets, properties under development, and land is currently recoverable. However, if market conditions deteriorate or if changes in our development strategy significantly affect any key assumptions used in our fair value estimates, we may need to take material charges in future periods for impairments related to existing assets. Any such material non-cash charges could have an adverse effect on our consolidated financial position and results of operations.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Cash and Cash Equivalents</font><font style="font-family:inherit;font-size:10pt;">. All cash and investments in money market accounts and other highly liquid securities with a maturity of three months or less at the date of purchase are considered to be cash and cash equivalents. We maintain the majority of our cash and cash equivalents at major financial institutions in the United States and deposits with these financial institutions may exceed the amount of insurance provided on such deposits; however, we regularly monitor the financial stability of these financial institutions and believe we are not currently exposed to any significant default risk with respect to these deposits.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Cost Capitalization</font><font style="font-family:inherit;font-size:10pt;">. Real estate assets are carried at cost plus capitalized carrying charges. Carrying charges are primarily interest and real estate taxes which are capitalized as part of properties under development. Capitalized interest is generally based on the weighted average interest rate of our unsecured debt. Expenditures directly related to the development and improvement of real estate assets are capitalized at cost as land and buildings and improvements. Indirect development costs, including salaries and benefits and other related costs directly attributable to the development of properties, are also capitalized. We begin capitalizing development, construction, and carrying costs when the development of the future real estate asset is probable and activities necessary to get the underlying real estate asset ready for its intended use have been initiated. All construction and carrying costs are capitalized and reported in the balance sheet as properties under development until the apartment homes are substantially completed. Upon substantial completion of the apartment homes, the total capitalized development cost for the apartment homes and the associated land is transferred to buildings and improvements and land, respectively.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">As discussed above, carrying charges are principally interest and real estate taxes capitalized as part of properties under development. Capitalized interest was approximately </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">$12.5 million</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">$8.8 million</font><font style="font-family:inherit;font-size:10pt;">, and </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">$5.7 million</font><font style="font-family:inherit;font-size:10pt;"> for the years ended </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">December 31, 2012</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">2011</font><font style="font-family:inherit;font-size:10pt;">, and </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">2010</font><font style="font-family:inherit;font-size:10pt;">, respectively. Capitalized real estate taxes were approximately </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">$2.8 million</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">$1.4 million</font><font style="font-family:inherit;font-size:10pt;">, and </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">$0.8 million</font><font style="font-family:inherit;font-size:10pt;"> for the years ended </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">December 31, 2012</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">2011</font><font style="font-family:inherit;font-size:10pt;">, and </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">2010</font><font style="font-family:inherit;font-size:10pt;">, respectively.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Where possible, we stage our construction to allow leasing and occupancy during the construction period, which we believe minimizes the duration of the lease-up period following completion of construction. Our accounting policy related to properties in the development and leasing phase is to expense all operating expenses associated with completed apartment homes. We capitalize renovation and improvement costs we believe extend the economic lives of depreciable property. Capital expenditures subsequent to initial construction are capitalized and depreciated over their estimated useful lives.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Depreciation and amortization is computed over the expected useful lives of depreciable property on a straight-line basis with lives generally as follows:</font></div><div style="line-height:120%;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;"> </font></div><div style="line-height:120%;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="2" rowspan="1"></td></tr><tr><td width="80%" rowspan="1" colspan="1"></td><td width="20%" rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">Estimated</font></div><div style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">Useful  Life</font></div></td></tr><tr><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Buildings and improvements</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">5-35 years</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Furniture, fixtures, equipment and other</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">3-20 years</font></div></td></tr><tr><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Intangible assets (in-place leases and above and below market leases)</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">underlying lease term</font></div></td></tr></table></div><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Discontinued Operations</font><font style="font-family:inherit;font-size:10pt;">. A property is classified as a discontinued operation when (i) the operations and cash flows of the property can be clearly distinguished and have been or will be eliminated from our ongoing operations; (ii) the property has either been disposed of or is classified as held for sale; and (iii) we will not have any significant continuing involvement in the operations of the property after the disposal transactions. Significant judgments are involved in determining whether a property meets the criteria for discontinued operations reporting and the period in which these criteria are met. A property is classified as held for sale when (i) management commits to a plan to sell and it is actively marketed; (ii) it is available for immediate sale in its present condition and the sale is expected to be completed within one year; and (iii) it is unlikely significant changes to the plan will be made or the plan will be withdrawn.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The results of operations for properties sold during the period or classified as held for sale at the end of the current period are classified as discontinued operations in the current and prior periods. The property-specific components of earnings classified as discontinued operations include separately identifiable property-specific revenues, expenses, depreciation, and interest expense, if any. The gain or loss resulting from the eventual disposal of the held for sale properties is also classified within discontinued operations. Real estate assets held for sale are measured at the lower of carrying amount or fair value less costs to sell and are presented separately in the accompanying consolidated balance sheets. Subsequent to classification of a property as held for sale, no further depreciation is recorded. Properties sold by our unconsolidated entities are not included in discontinued operations and related gains or losses are reported as a component of equity in income (loss) of joint ventures.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Gains on sale of real estate are recognized using the full accrual or partial sale methods, as applicable, in accordance with accounting principles generally accepted in the United States of America (“GAAP”), provided various criteria relating to the terms of sale and any subsequent involvement with the real estate sold are satisfied.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Fair Value</font><font style="font-family:inherit;font-size:10pt;">. For financial assets and liabilities recorded at fair value on a recurring basis, fair value is the price we would receive to sell an asset, or pay to transfer a liability, in an orderly transaction with a market participant at the measurement date. In the absence of such data, fair value is estimated using internal information consistent with what market participants would use in a hypothetical transaction.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In determining fair value, observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our market assumptions; preference is given to observable inputs. These two types of inputs create the following fair value hierarchy:</font></div><div style="line-height:120%;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;"> </font></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:60px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:36px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Level 1: Quoted prices for identical instruments in active markets.</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:60px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:36px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Level 2: Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable or whose significant value drivers are observable.</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:60px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:36px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Level 3: Significant inputs to the valuation model are unobservable.</font></div></td></tr></table><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Recurring Fair Value Disclosures.</font><font style="font-family:inherit;font-size:10pt;"> The following describes the valuation methodologies we use to measure different financial instruments at fair value on a recurring basis:</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;padding-left:48px;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Deferred Compensation Plan Investments.</font><font style="font-family:inherit;font-size:10pt;"> The estimated fair values of investment securities classified as deferred compensation plan investments are based on quoted market prices utilizing public information for the same transactions. Our deferred compensation plan investments are recorded in other assets in our consolidated balance sheets.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;padding-left:48px;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Derivative Financial Instruments.</font><font style="font-family:inherit;font-size:10pt;"> The estimated fair values of derivative financial instruments are valued using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and volatility. The fair values of interest rate swaps and caps are estimated using the market standard methodology of netting the discounted fixed cash payments and the discounted expected variable cash receipts. The variable cash receipts are based on an expectation of interest rates (forward curves) derived from observable market interest rate curves. In addition, credit valuation adjustments, which consider the impact of any credit enhancements to the contracts, are incorporated in the fair values to account for potential nonperformance risk, including our own nonperformance risk and the respective counterparty’s nonperformance risk. The fair value of interest rate caps is determined using the market standard methodology of discounting the future expected cash receipts which would occur if variable interest rates rise above the strike rate of the caps. The variable interest rates used in the calculation of projected receipts on the cap are based on an expectation of future interest rates derived from observed market interest rate curves and volatilities.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;padding-left:48px;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Although we have determined the majority of the inputs used to value our derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with our derivatives utilize Level 3 inputs, such as estimates of current credit spreads, to evaluate the likelihood of default. However, we have assessed the significance of the impact of the credit valuation adjustments on the overall valuation of our derivative positions and have determined the credit valuation adjustments are not significant to the overall valuation of our derivatives. As a result, we have determined our derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Financial Instrument Fair Value Disclosures. </font><font style="font-family:inherit;font-size:10pt;">In calculating the fair value of our notes payable, interest rate and spread assumptions used in our calculations reflect our current credit worthiness and market conditions available for the issuance of notes payable with similar terms and remaining maturities. These financial instruments utilize Level 2 inputs.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Non-recurring Fair Value Disclosures.</font><font style="font-family:inherit;font-size:10pt;"> Certain assets are measured at fair value on a non-recurring basis. These assets are not measured at fair value on an ongoing basis, but are subject to fair value adjustments in certain circumstances. These assets primarily include long-lived assets which are recorded at fair value when they are impaired. The fair value methodologies used to measure long-lived assets are described above at "Asset Impairment." The inputs associated with the valuation of long-lived assets are generally included in Level 3 of the fair value hierarchy.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Income Recognition</font><font style="font-family:inherit;font-size:10pt;">. Our rental and other property revenue is recorded when due from residents and is recognized monthly as it is earned. Other property revenue consists primarily of utility rebillings and administrative, application, and other transactional fees charged to our residents. Our apartment homes are rented to residents on lease terms generally ranging from six to fifteen months, with monthly payments due in advance. All other sources of income, including interest and fee and asset management income, are recognized as earned. </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">Nine</font><font style="font-family:inherit;font-size:10pt;"> of our properties are subject to rent control. Operations of multifamily properties acquired are recorded from the date of acquisition in accordance with the acquisition method of accounting. In management’s opinion, due to the number of residents, the types and diversity of submarkets in which our properties operate, and the collection terms, there is no significant concentration of credit risk.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Insurance</font><font style="font-family:inherit;font-size:10pt;">. Our primary lines of insurance coverage are property, general liability, and health and workers’ compensation. We believe our insurance coverage adequately insures our properties against the risk of loss attributable to fire, earthquake, hurricane, tornado, flood, and other perils and adequately insures us against other risks. Losses are accrued based upon our estimates of the aggregate liability for claims incurred using certain actuarial assumptions followed in the insurance industry and based on our experience.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Other Assets, Net</font><font style="font-family:inherit;font-size:10pt;">. Other assets in our consolidated financial statements include investments under deferred compensation plans, deferred financing costs, non-real estate leasehold improvements and equipment, prepaid expenses, the value of in-place leases net of related accumulated amortization, available-for-sale investments, and other miscellaneous receivables. Investments under deferred compensation plans are classified as trading securities and are adjusted to fair market value at period end. See further discussion of our investments under deferred compensation plans in Note 11, “Share-based Compensation and Benefit Plans.” Deferred financing costs are amortized no longer than the terms of the related debt on the straight-line method, which approximates the effective interest method. Corporate leasehold improvements and equipment are depreciated using the straight-line method over the shorter of the expected useful lives or the lease terms which range from three to ten years. Our available-for-sale investments are carried at fair value with unrealized gains and losses included in accumulated other comprehensive income (loss), a separate component of shareholders’ equity.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Reportable Segments</font><font style="font-family:inherit;font-size:10pt;">. Our multifamily communities are geographically diversified throughout the United States, and management evaluates operating performance on an individual property level. As each of our apartment communities has similar economic characteristics, residents, and products and services, our apartment communities have been aggregated into one reportable segment. Our multifamily communities generate rental revenue and other income through the leasing of apartment homes, which comprised approximately </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">98%</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">98%</font><font style="font-family:inherit;font-size:10pt;">, and </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">97%</font><font style="font-family:inherit;font-size:10pt;"> of our total property revenues and total non-property income, excluding income on deferred compensation plans, for the years ended </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">December 31, 2012</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">2011</font><font style="font-family:inherit;font-size:10pt;">, and </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">2010</font><font style="font-family:inherit;font-size:10pt;">, respectively.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Restricted Cash</font><font style="font-family:inherit;font-size:10pt;">. Restricted cash consists of escrow deposits held by lenders for property taxes, insurance and replacement reserves, cash required to be segregated for the repayment of residents’ security deposits, and escrowed amounts related to our development and acquisition activities. Substantially all restricted cash is invested in demand and short-term instruments.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Share-based Compensation</font><font style="font-family:inherit;font-size:10pt;">. Compensation expense associated with share-based awards is recognized in our consolidated statements of income and comprehensive income using the grant-date fair values. Compensation cost for all share-based awards, including options, requires measurement at estimated fair value on the grant date and recognition of compensation expense over the requisite service period for awards expected to vest. The fair value of stock option grants is estimated using the Black-Scholes valuation model. Valuation models require the input of assumptions, including judgments to estimate the expected stock price volatility, expected life, and forfeiture rate. The compensation cost for share-based awards is based on the market value of the shares on the date of grant.</font></div><div style="line-height:120%;padding-top:10px;text-align:justify;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Use of Estimates</font><font style="font-family:inherit;font-size:10pt;">. In the application of GAAP, management is required to make estimates and assumptions which affect the reported amounts of assets and liabilities at the date of the financial statements, results of operations during the reporting periods, and related disclosures. Our more significant estimates include estimates supporting our impairment analysis related to the carrying values of our real estate assets, and estimates related to the valuation of our investments in joint ventures. These estimates are based on historical experience and other assumptions believed to be reasonable under the circumstances. Future events rarely develop exactly as forecasted, and the best estimates routinely require adjustment.</font></div></div>
CY2012Q4	cpt	Business Acquisition Purchase Price Allocation Land Acquired BusinessAcquisitionPurchasePriceAllocationLandAcquired	174600000	USD
CY2012Q4	cpt	Business Acquistion Purchase Price Allocation Restricted Cash Acquired BusinessAcquistionPurchasePriceAllocationRestrictedCashAcquired	700000	USD
CY2012	cpt	Business Combination Pro Forma Information Property Expenses Since Acquisition Date Actual BusinessCombinationProFormaInformationPropertyExpensesSinceAcquisitionDateActual	21000000	USD
CY2012	cpt	Capitalized Real Estate Taxes CapitalizedRealEstateTaxes	2800000	USD
CY2010	cpt	Capitalized Real Estate Taxes CapitalizedRealEstateTaxes	800000	USD
CY2011	cpt	Capitalized Real Estate Taxes CapitalizedRealEstateTaxes	1400000	USD
CY2012Q4	cpt	Cash Required By Plan Participants Upon Withdrawal CashRequiredByPlanParticipantsUponWithdrawal	25700000	USD
CY2011Q4	cpt	Cash Required By Plan Participants Upon Withdrawal CashRequiredByPlanParticipantsUponWithdrawal	28700000	USD
CY2012	cpt	Change In Common Shareholders Equity And Net Transfers From Noncontrolling Interests ChangeInCommonShareholdersEquityAndNetTransfersFromNoncontrollingInterests	272835000	USD
CY2010	cpt	Change In Common Shareholders Equity And Net Transfers From Noncontrolling Interests ChangeInCommonShareholdersEquityAndNetTransfersFromNoncontrollingInterests	26744000	USD
CY2011	cpt	Change In Common Shareholders Equity And Net Transfers From Noncontrolling Interests ChangeInCommonShareholdersEquityAndNetTransfersFromNoncontrollingInterests	49971000	USD
CY2011Q4	cpt	Common Shares Outstanding Including Treasury Shares CommonSharesOutstandingIncludingTreasuryShares	84517000	shares
CY2012Q4	cpt	Common Shares Outstanding Including Treasury Shares CommonSharesOutstandingIncludingTreasuryShares	96201000	shares
CY2011Q4	cpt	Common Stocks Value Outstanding CommonStocksValueOutstanding	845000	USD
CY2012Q4	cpt	Common Stocks Value Outstanding CommonStocksValueOutstanding	962000	USD
CY2011	cpt	Conversion Of Mezzanine Note To Investment In Joint Venture ConversionOfMezzanineNoteToInvestmentInJointVenture	0	USD
CY2012	cpt	Conversion Of Mezzanine Note To Investment In Joint Venture ConversionOfMezzanineNoteToInvestmentInJointVenture	0	USD
CY2010	cpt	Conversion Of Mezzanine Note To Investment In Joint Venture ConversionOfMezzanineNoteToInvestmentInJointVenture	43279000	USD
CY2012	cpt	Decrease In Apic For Purchase Of Remaining Noncontrolling Ownership Interest In Consolidated Jv DecreaseInApicForPurchaseOfRemainingNoncontrollingOwnershipInterestInConsolidatedJv	19549000	USD
CY2011	cpt	Decrease In Apic For Purchase Of Remaining Noncontrolling Ownership Interest In Consolidated Jv DecreaseInApicForPurchaseOfRemainingNoncontrollingOwnershipInterestInConsolidatedJv	0	USD
CY2010	cpt	Decrease In Apic For Purchase Of Remaining Noncontrolling Ownership Interest In Consolidated Jv DecreaseInApicForPurchaseOfRemainingNoncontrollingOwnershipInterestInConsolidatedJv	0	USD
CY2012	cpt	Defined Benefit Plan Effect Of One Percentage Point Increase Decrease On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseDecreaseOnServiceAndInterestCostComponents	0	USD
CY2012	cpt	Defined Benefit Plan Increase Decrease In Assumed Health Care Cost Trend Rates DefinedBenefitPlanIncreaseDecreaseInAssumedHealthCareCostTrendRates	0.01
CY2012	cpt	Defined Beneft Plan Amortization Of Net Prior Service Cost And Net Loss Credit DefinedBeneftPlanAmortizationOfNetPriorServiceCostAndNetLossCredit	-30000	USD
CY2011	cpt	Defined Beneft Plan Amortization Of Net Prior Service Cost And Net Loss Credit DefinedBeneftPlanAmortizationOfNetPriorServiceCostAndNetLossCredit	-16000	USD
CY2012Q4	cpt	Difference Between Carry Value Of Net Assets And Tax Basis Of Net Assets DifferenceBetweenCarryValueOfNetAssetsAndTaxBasisOfNetAssets	953700000	USD
CY2012Q4	cpt	Discounted Notes Payable Face Amount DiscountedNotesPayableFaceAmount	0.98945
CY2011	cpt	Disposal Group Including Discontinued Operation Depreciation And Amortization DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization	11038000	USD
CY2012	cpt	Disposal Group Including Discontinued Operation Depreciation And Amortization DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization	6795000	USD
CY2010	cpt	Disposal Group Including Discontinued Operation Depreciation And Amortization DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization	13800000	USD
CY2012Q4	cpt	Distributions Payable DistributionsPayable	49969000	USD
CY2011Q4	cpt	Distributions Payable DistributionsPayable	39364000	USD
CY2010	cpt	Dividends Paid In Excess Of Taxable Income DividendsPaidInExcessOfTaxableIncome	-50966000	USD
CY2011	cpt	Dividends Paid In Excess Of Taxable Income DividendsPaidInExcessOfTaxableIncome	-57443000	USD
CY2012	cpt	Dividends Paid In Excess Of Taxable Income DividendsPaidInExcessOfTaxableIncome	0	USD
CY2012	cpt	Effect Of One Percentage Point Increase Decrease On Accumulated Postretirement Benefit Obligation EffectOfOnePercentagePointIncreaseDecreaseOnAccumulatedPostretirementBenefitObligation	100000	USD
CY2012	cpt	Employee Share Purchase Plan Maximum Authorized Amount Per Participant EmployeeSharePurchasePlanMaximumAuthorizedAmountPerParticipant	0	USD
CY2012	cpt	Employer Contribution To Post Retirement Medical Benefit EmployerContributionToPostRetirementMedicalBenefit	1000	USD
CY2010	cpt	Income Loss From Continuing Operations After Adjustment For Amount Allocated To Participating Securities IncomeLossFromContinuingOperationsAfterAdjustmentForAmountAllocatedToParticipatingSecurities	-560000	USD
CY2011	cpt	Income Loss From Continuing Operations After Adjustment For Amount Allocated To Participating Securities IncomeLossFromContinuingOperationsAfterAdjustmentForAmountAllocatedToParticipatingSecurities	12621000	USD
CY2012	cpt	Income Loss From Continuing Operations After Adjustment For Amount Allocated To Participating Securities IncomeLossFromContinuingOperationsAfterAdjustmentForAmountAllocatedToParticipatingSecurities	158881000	USD
CY2012Q4	cpt	Income Loss From Disposition Of Discontinued Operations Per Basic Share IncomeLossFromDispositionOfDiscontinuedOperationsPerBasicShare	0.96
CY2011Q4	cpt	Income Loss From Disposition Of Discontinued Operations Per Basic Share IncomeLossFromDispositionOfDiscontinuedOperationsPerBasicShare	0.33
CY2012Q1	cpt	Income Loss From Disposition Of Discontinued Operations Per Basic Share IncomeLossFromDispositionOfDiscontinuedOperationsPerBasicShare	0.41
CY2012Q1	cpt	Income Loss From Disposition Of Discontinued Operations Per Diluted Share IncomeLossFromDispositionOfDiscontinuedOperationsPerDilutedShare	0.39
CY2012Q1	cpt	Income Loss From Acquisition Of Remaining Non Controlling Ownership Interest Per Diluted Share IncomeLossFromAcquisitionOfRemainingNonControllingOwnershipInterestPerDilutedShare	0.49
CY2012Q4	cpt	Income Loss From Acquisition Of Remaining Non Controlling Ownership Interest Per Diluted Share IncomeLossFromAcquisitionOfRemainingNonControllingOwnershipInterestPerDilutedShare	0.20
CY2012	cpt	Income Loss From Continuing Operations After Adjustment For Amount Allocated To Common Units IncomeLossFromContinuingOperationsAfterAdjustmentForAmountAllocatedToCommonUnits	160865000	USD
CY2011	cpt	Income Loss From Continuing Operations After Adjustment For Amount Allocated To Common Units IncomeLossFromContinuingOperationsAfterAdjustmentForAmountAllocatedToCommonUnits	12621000	USD
CY2010	cpt	Income Loss From Continuing Operations After Adjustment For Amount Allocated To Common Units IncomeLossFromContinuingOperationsAfterAdjustmentForAmountAllocatedToCommonUnits	-560000	USD
CY2012	cpt	Expected Useful Lives Of Intangible Assets Related To In Place Leases And Above And Below Market Leases ExpectedUsefulLivesOfIntangibleAssetsRelatedToInPlaceLeasesAndAboveAndBelowMarketLeases	underlying lease term
CY2012	cpt	Expense Benefit On Deferred Compensation Plans ExpenseBenefitOnDeferredCompensationPlans	4772000	USD
CY2011	cpt	Expense Benefit On Deferred Compensation Plans ExpenseBenefitOnDeferredCompensationPlans	6773000	USD
CY2010	cpt	Expense Benefit On Deferred Compensation Plans ExpenseBenefitOnDeferredCompensationPlans	11581000	USD
CY2012	cpt	Fees Earned For Property And Asset Management Construction Development And Other Services To Joint Ventures FeesEarnedForPropertyAndAssetManagementConstructionDevelopmentAndOtherServicesToJointVentures	11400000	USD
CY2011	cpt	Fees Earned For Property And Asset Management Construction Development And Other Services To Joint Ventures FeesEarnedForPropertyAndAssetManagementConstructionDevelopmentAndOtherServicesToJointVentures	9300000	USD
CY2010	cpt	Fees Earned For Property And Asset Management Construction Development And Other Services To Joint Ventures FeesEarnedForPropertyAndAssetManagementConstructionDevelopmentAndOtherServicesToJointVentures	6200000	USD
CY2012Q3	cpt	Gain Loss On Sale Of Unconsolidated Jv Property GainLossOnSaleOfUnconsolidatedJvProperty	2875000	USD
CY2012Q4	cpt	Gain Loss On Sale Of Unconsolidated Jv Property GainLossOnSaleOfUnconsolidatedJvProperty	14543000	USD
CY2011Q4	cpt	Gain Loss On Sale Of Unconsolidated Jv Property GainLossOnSaleOfUnconsolidatedJvProperty	6394000	USD
CY2010	cpt	Gain On Sale Of Operating Property Net Of Tax GainOnSaleOfOperatingPropertyNetOfTax	0	USD
CY2011	cpt	Gain On Sale Of Operating Property Net Of Tax GainOnSaleOfOperatingPropertyNetOfTax	17400000	USD
CY2012	cpt	Gain On Sale Of Operating Property Net Of Tax GainOnSaleOfOperatingPropertyNetOfTax	49700000	USD
CY2011	cpt	Impairment Provision On Technology Investment ImpairmentProvisionOnTechnologyInvestment	0	USD
CY2012	cpt	Impairment Provision On Technology Investment ImpairmentProvisionOnTechnologyInvestment	0	USD
CY2010	cpt	Impairment Provision On Technology Investment ImpairmentProvisionOnTechnologyInvestment	1000000	USD
CY2011	cpt	Income Allocated To Common Units IncomeAllocatedToCommonUnits	0	USD
CY2012	cpt	Income Allocated To Common Units IncomeAllocatedToCommonUnits	1984000	USD
CY2010	cpt	Income Allocated To Common Units IncomeAllocatedToCommonUnits	0	USD
CY2012Q1	cpt	Income Loss From Acquisition Of Remaining Non Controlling Ownership Interest Per Basic Share IncomeLossFromAcquisitionOfRemainingNonControllingOwnershipInterestPerBasicShare	0.50
CY2012Q4	cpt	Income Loss From Acquisition Of Remaining Non Controlling Ownership Interest Per Basic Share IncomeLossFromAcquisitionOfRemainingNonControllingOwnershipInterestPerBasicShare	0.20
CY2012Q4	cpt	Income Loss From Disposition Of Discontinued Operations Per Diluted Share IncomeLossFromDispositionOfDiscontinuedOperationsPerDilutedShare	0.94
CY2011Q4	cpt	Income Loss From Disposition Of Discontinued Operations Per Diluted Share IncomeLossFromDispositionOfDiscontinuedOperationsPerDilutedShare	0.33
CY2012Q4	cpt	Income Loss From Disposition Of Unconsolidated Joint Venture Property Per Basic Share IncomeLossFromDispositionOfUnconsolidatedJointVenturePropertyPerBasicShare	0.17
CY2012Q3	cpt	Income Loss From Disposition Of Unconsolidated Joint Venture Property Per Basic Share IncomeLossFromDispositionOfUnconsolidatedJointVenturePropertyPerBasicShare	0.03
CY2011Q4	cpt	Income Loss From Disposition Of Unconsolidated Joint Venture Property Per Basic Share IncomeLossFromDispositionOfUnconsolidatedJointVenturePropertyPerBasicShare	0.09
CY2012Q3	cpt	Income Loss From Disposition Of Unconsolidated Joint Venture Property Per Diluted Share IncomeLossFromDispositionOfUnconsolidatedJointVenturePropertyPerDilutedShare	0.03
CY2012Q4	cpt	Income Loss From Disposition Of Unconsolidated Joint Venture Property Per Diluted Share IncomeLossFromDispositionOfUnconsolidatedJointVenturePropertyPerDilutedShare	0.17
CY2011Q4	cpt	Income Loss From Disposition Of Unconsolidated Joint Venture Property Per Diluted Share IncomeLossFromDispositionOfUnconsolidatedJointVenturePropertyPerDilutedShare	0.09
CY2011Q2	cpt	Income Loss From Sale Of Undeveloped Land To Joint Venture Per Basic Share IncomeLossFromSaleOfUndevelopedLandToJointVenturePerBasicShare	0.07
CY2011Q2	cpt	Income Loss From Sale Of Undeveloped Land To Joint Venture Per Diluted Share IncomeLossFromSaleOfUndevelopedLandToJointVenturePerDilutedShare	0.07
CY2010	cpt	Income Loss On Deferred Compensation Plans IncomeLossOnDeferredCompensationPlans	11581000	USD
CY2011	cpt	Income Loss On Deferred Compensation Plans IncomeLossOnDeferredCompensationPlans	6773000	USD
CY2012	cpt	Income Loss On Deferred Compensation Plans IncomeLossOnDeferredCompensationPlans	4772000	USD
CY2013	cpt	Income Tax Reconciliation Designated Dividends Included In Dividends Paid Deduction IncomeTaxReconciliationDesignatedDividendsIncludedInDividendsPaidDeduction	33300000	USD
CY2010	cpt	Income Tax Reconciliation Nondeductible Expense Depreciation And Amortization Including Discontinued Operations IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortizationIncludingDiscontinuedOperations	-179662000	USD
CY2012	cpt	Income Tax Reconciliation Nondeductible Expense Depreciation And Amortization Including Discontinued Operations IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortizationIncludingDiscontinuedOperations	-213479000	USD
CY2011	cpt	Income Tax Reconciliation Nondeductible Expense Depreciation And Amortization Including Discontinued Operations IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortizationIncludingDiscontinuedOperations	-188042000	USD
CY2011	cpt	Income Tax Reconciliation Nondeductible Expense Tax Depreciation And Amortization IncomeTaxReconciliationNondeductibleExpenseTaxDepreciationAndAmortization	155636000	USD
CY2010	cpt	Income Tax Reconciliation Nondeductible Expense Tax Depreciation And Amortization IncomeTaxReconciliationNondeductibleExpenseTaxDepreciationAndAmortization	158134000	USD
CY2012	cpt	Income Tax Reconciliation Nondeductible Expense Tax Depreciation And Amortization IncomeTaxReconciliationNondeductibleExpenseTaxDepreciationAndAmortization	171060000	USD
CY2011	cpt	Income Tax Reconciliation Tax Difference On Gains Losses From Capital Transactions IncomeTaxReconciliationTaxDifferenceOnGainsLossesFromCapitalTransactions	4315000	USD
CY2010	cpt	Income Tax Reconciliation Tax Difference On Gains Losses From Capital Transactions IncomeTaxReconciliationTaxDifferenceOnGainsLossesFromCapitalTransactions	-37798000	USD
CY2012	cpt	Income Tax Reconciliation Tax Difference On Gains Losses From Capital Transactions IncomeTaxReconciliationTaxDifferenceOnGainsLossesFromCapitalTransactions	63832000	USD
CY2011Q3	cpt	Loss From Discontinuation Of Hedging Relationship Per Basic Share LossFromDiscontinuationOfHedgingRelationshipPerBasicShare	0
CY2011Q2	cpt	Loss From Discontinuation Of Hedging Relationship Per Diluted Share LossFromDiscontinuationOfHedgingRelationshipPerDilutedShare	0.41
CY2010	cpt	Loss Of Taxable Real Estate Investment Trust Subsidiaries Included In Net Income Loss Attributable To Common Shareholders LossOfTaxableRealEstateInvestmentTrustSubsidiariesIncludedInNetIncomeLossAttributableToCommonShareholders	2056000	USD
CY2011	cpt	Loss Of Taxable Real Estate Investment Trust Subsidiaries Included In Net Income Loss Attributable To Common Shareholders LossOfTaxableRealEstateInvestmentTrustSubsidiariesIncludedInNetIncomeLossAttributableToCommonShareholders	539000	USD
CY2012	cpt	Loss Of Taxable Real Estate Investment Trust Subsidiaries Included In Net Income Loss Attributable To Common Shareholders LossOfTaxableRealEstateInvestmentTrustSubsidiariesIncludedInNetIncomeLossAttributableToCommonShareholders	3323000	USD
CY2011	cpt	Net Income Attributable To Common Shareholders And Noncontrolling Interests NetIncomeAttributableToCommonShareholdersAndNoncontrollingInterests	52961000	USD
CY2010	cpt	Net Income Attributable To Common Shareholders And Noncontrolling Interests NetIncomeAttributableToCommonShareholdersAndNoncontrollingInterests	24142000	USD
CY2012	cpt	Net Income Attributable To Common Shareholders And Noncontrolling Interests NetIncomeAttributableToCommonShareholdersAndNoncontrollingInterests	291049000	USD
CY2012	cpt	Net Income Loss From Real Estate Investment Trust Operations NetIncomeLossFromRealEstateInvestmentTrustOperations	286713000	USD
CY2011	cpt	Net Income Loss From Real Estate Investment Trust Operations NetIncomeLossFromRealEstateInvestmentTrustOperations	49918000	USD
CY2010	cpt	Net Income Loss From Real Estate Investment Trust Operations NetIncomeLossFromRealEstateInvestmentTrustOperations	25272000	USD
CY2012Q4	cpt	Net Operating Real Estate Assets NetOperatingRealEstateAssets	4820555000	USD
CY2011Q4	cpt	Net Operating Real Estate Assets NetOperatingRealEstateAssets	4086871000	USD
CY2012	cpt	Noncontrolling Interest Increase From Equity Upon Conversion Of Operating Partnership Unit NoncontrollingInterestIncreaseFromEquityUponConversionOfOperatingPartnershipUnit	8994000	USD
CY2011	cpt	Noncontrolling Interest Increase From Equity Upon Conversion Of Operating Partnership Unit NoncontrollingInterestIncreaseFromEquityUponConversionOfOperatingPartnershipUnit	592000	USD
CY2010	cpt	Noncontrolling Interest Increase From Equity Upon Conversion Of Operating Partnership Unit NoncontrollingInterestIncreaseFromEquityUponConversionOfOperatingPartnershipUnit	3528000	USD
CY2012	cpt	Number Of Apartment Units In Property Disposed NumberOfApartmentUnitsInPropertyDisposed	3213
CY2012Q4	cpt	Number Of Assets Classified As Held For Sale NumberOfAssetsClassifiedAsHeldForSale	1
CY2012	cpt	Number Of Fully Consolidated Joint Ventures Acquired NumberOfFullyConsolidatedJointVenturesAcquired	3
CY2012	cpt	Number Of Joint Ventures Accounted For Under Equity Method Investments NumberOfJointVenturesAccountedForUnderEquityMethodInvestments	4
CY2012Q4	cpt	Number Of Multifamily Communities NumberOfMultifamilyCommunities	202
CY2012Q4	cpt	Number Of Multifamily Properties Under Development NumberOfMultifamilyPropertiesUnderDevelopment	9
CY2011Q4	cpt	Number Of Apartment Units In Property Disposed NumberOfApartmentUnitsInPropertyDisposed	788
CY2013Q1	cpt	Number Of Apartment Units In Property Disposed NumberOfApartmentUnitsInPropertyDisposed	770
CY2012	cpt	Number Of Apartment Units In Property Of Which Noncontrolling Ownership Interests Were Acquired NumberOfApartmentUnitsInPropertyOfWhichNoncontrollingOwnershipInterestsWereAcquired	680
CY2012Q1	cpt	Number Of Apartment Units In Wholly Owned Property Acquired NumberOfApartmentUnitsInWhollyOwnedPropertyAcquired	4034
CY2012	cpt	Number Of Apartment Units In Wholly Owned Property Acquired NumberOfApartmentUnitsInWhollyOwnedPropertyAcquired	2114
CY2012Q4	cpt	Number Of Apartment Units In Wholly Owned Property Acquired NumberOfApartmentUnitsInWhollyOwnedPropertyAcquired	320
CY2012	cpt	Number Of Operating Properties Acquired NumberOfOperatingPropertiesAcquired	7
CY2012	cpt	Number Of Operating Properties Sold NumberOfOperatingPropertiesSold	11
CY2011Q4	cpt	Number Of Operating Properties Sold NumberOfOperatingPropertiesSold	2
	cpt	Number Of Operating Properties Sold NumberOfOperatingPropertiesSold	2
CY2011Q4	cpt	Number Of Operating Properties Sold NumberOfOperatingPropertiesSold	4
CY2012Q1	cpt	Number Of Unconsolidated Equity Method Investments Acquired NumberOfUnconsolidatedEquityMethodInvestmentsAcquired	12
CY2012Q4	cpt	Number Of Unconsolidated Equity Method Investments Acquired NumberOfUnconsolidatedEquityMethodInvestmentsAcquired	1
CY2012	cpt	Participant Withdrawals From Deferred Compensation Plan Investments ParticipantWithdrawalsFromDeferredCompensationPlanInvestments	12100000	USD
CY2012Q4	cpt	Percentage Of Income Distributions Representing Tax Preference Items PercentageOfIncomeDistributionsRepresentingTaxPreferenceItems	0.0572
CY2010Q4	cpt	Percentage Of Income Distributions Representing Tax Preference Items PercentageOfIncomeDistributionsRepresentingTaxPreferenceItems	0.0391
CY2011Q4	cpt	Percentage Of Income Distributions Representing Tax Preference Items PercentageOfIncomeDistributionsRepresentingTaxPreferenceItems	0.0283
CY2012	cpt	Percentage Of Market Value Per Share At Which Shares Purchased Under Employee Share Purchase Plan PercentageOfMarketValuePerShareAtWhichSharesPurchasedUnderEmployeeSharePurchasePlan	0.85
CY2012	cpt	Percentage Of Rental Revenue And Other Income From Leasing Of Apartment Homes PercentageOfRentalRevenueAndOtherIncomeFromLeasingOfApartmentHomes	0.98
CY2010	cpt	Percentage Of Rental Revenue And Other Income From Leasing Of Apartment Homes PercentageOfRentalRevenueAndOtherIncomeFromLeasingOfApartmentHomes	0.97
CY2011	cpt	Percentage Of Rental Revenue And Other Income From Leasing Of Apartment Homes PercentageOfRentalRevenueAndOtherIncomeFromLeasingOfApartmentHomes	0.98
CY2012Q4	cpt	Perpetual Preferred Units PerpetualPreferredUnits	0	USD
CY2011Q4	cpt	Perpetual Preferred Units PerpetualPreferredUnits	97925000	USD
CY2013	cpt	Post Retirement Benefit Contribution For Office Space Current Year PostRetirementBenefitContributionForOfficeSpaceCurrentYear	200000	USD
CY2012	cpt	Post Retirement Benefit Contribution For Office Space Current Year PostRetirementBenefitContributionForOfficeSpaceCurrentYear	200000	USD
CY2012	cpt	Pro Forma Consolidated Expenses ProFormaConsolidatedExpenses	280232000	USD
CY2011	cpt	Pro Forma Consolidated Expenses ProFormaConsolidatedExpenses	270639000	USD
CY2012	cpt	Pro Forma Consolidated Property Results ProFormaConsolidatedPropertyResults	476923000	USD
CY2011	cpt	Pro Forma Consolidated Property Results ProFormaConsolidatedPropertyResults	425991000	USD
CY2012	cpt	Pro Forma Consolidated Revenues ProFormaConsolidatedRevenues	757155000	USD
CY2011	cpt	Pro Forma Consolidated Revenues ProFormaConsolidatedRevenues	696630000	USD
CY2012Q4	cpt	Proceeds From Notes Payable Net Of Issuance Costs ProceedsFromNotesPayableNetOfIssuanceCosts	343700000	USD
CY2012Q4	cpt	Properties Subject To Rent Control PropertiesSubjectToRentControl	9
CY2012Q4	cpt	Properties Under Development Including Land PropertiesUnderDevelopmentIncludingLand	334463000	USD
CY2011Q4	cpt	Properties Under Development Including Land PropertiesUnderDevelopmentIncludingLand	299870000	USD
CY2012Q4	cpt	Real Estate And Accumulated Depreciation Total Cost Of Real Estate Assets Net Of Accumulated Depreciation RealEstateAndAccumulatedDepreciationTotalCostOfRealEstateAssetsNetOfAccumulatedDepreciation	5155018000	USD
CY2011Q4	cpt	Real Estate Assets At Cost Total RealEstateAssetsAtCostTotal	5519670000	USD
CY2012Q4	cpt	Real Estate Assets At Cost Total RealEstateAssetsAtCostTotal	6339451000	USD
CY2011Q4	cpt	Real Estate Assets Total RealEstateAssetsTotal	4442716000	USD
CY2012Q4	cpt	Real Estate Assets Total RealEstateAssetsTotal	5230627000	USD
CY2010	cpt	Real Estate Cost Of Real Estate Contributed To Joint Venture RealEstateCostOfRealEstateContributedToJointVenture	0	USD
CY2012	cpt	Real Estate Cost Of Real Estate Contributed To Joint Venture RealEstateCostOfRealEstateContributedToJointVenture	0	USD
CY2011	cpt	Real Estate Cost Of Real Estate Contributed To Joint Venture RealEstateCostOfRealEstateContributedToJointVenture	-12578000	USD
CY2010	cpt	Real Estate Development RealEstateDevelopment	21798000	USD
CY2011	cpt	Real Estate Development RealEstateDevelopment	180028000	USD
CY2012	cpt	Real Estate Development RealEstateDevelopment	232296000	USD
CY2010	cpt	Real Estate Investment Trust Taxable Income RealEstateInvestmentTrustTaxableIncome	74033000	USD
CY2012	cpt	Real Estate Investment Trust Taxable Income RealEstateInvestmentTrustTaxableIncome	224339000	USD
CY2011	cpt	Real Estate Investment Trust Taxable Income RealEstateInvestmentTrustTaxableIncome	86214000	USD
CY2012	cpt	Reclassification Of Prior Service Cost And Loss ReclassificationOfPriorServiceCostAndLoss	-30000	USD
CY2011	cpt	Reclassification Of Prior Service Cost And Loss ReclassificationOfPriorServiceCostAndLoss	0	USD
CY2010	cpt	Reclassification Of Prior Service Cost And Loss ReclassificationOfPriorServiceCostAndLoss	0	USD
CY2012	cpt	Redemption Of Perpetual Preferred Units RedemptionOfPerpetualPreferredUnits	100000000	USD
CY2010	cpt	Redemption Of Perpetual Preferred Units RedemptionOfPerpetualPreferredUnits	0	USD
CY2011	cpt	Redemption Of Perpetual Preferred Units RedemptionOfPerpetualPreferredUnits	0	USD
CY2010	cpt	Repayment Of Employee Notes Receivable Net RepaymentOfEmployeeNotesReceivableNet	101000	USD
CY2012	cpt	Revenues From Discontinued Operations Attributable To Unconsolidated Joint Venture RevenuesFromDiscontinuedOperationsAttributableToUnconsolidatedJointVenture	23300000	USD
CY2010	cpt	Revenues From Discontinued Operations Attributable To Unconsolidated Joint Venture RevenuesFromDiscontinuedOperationsAttributableToUnconsolidatedJointVenture	34800000	USD
CY2011	cpt	Revenues From Discontinued Operations Attributable To Unconsolidated Joint Venture RevenuesFromDiscontinuedOperationsAttributableToUnconsolidatedJointVenture	37700000	USD
CY2012	cpt	Sales Price Of Property Purchased SalesPriceOfPropertyPurchased	356000000	USD
CY2011Q4	cpt	Share Awards Held In Employee Trust Shares ShareAwardsHeldInEmployeeTrustShares	2000000	shares
CY2012Q4	cpt	Share Awards Held In Employee Trust Shares ShareAwardsHeldInEmployeeTrustShares	1900000	shares
CY2012Q4	cpt	Share Awards Held In Non Qualified Deferred Compensation Plan Shares ShareAwardsHeldInNonQualifiedDeferredCompensationPlanShares	1000000	shares
CY2011	cpt	Tax Treatment Of Return Of Capital Per Common Share Distributions TaxTreatmentOfReturnOfCapitalPerCommonShareDistributions	0.52
CY2012	cpt	Tax Treatment Of Return Of Capital Per Common Share Distributions TaxTreatmentOfReturnOfCapitalPerCommonShareDistributions	0.00
CY2012	cpt	Total Non Property Income Loss TotalNonPropertyIncomeLoss	16407000	USD
CY2010	cpt	Total Non Property Income Loss TotalNonPropertyIncomeLoss	28337000	USD
CY2011	cpt	Total Non Property Income Loss TotalNonPropertyIncomeLoss	21395000	USD
CY2012Q4	cpt	Total Number Of Apartment Homes In Multifamily Communities TotalNumberOfApartmentHomesInMultifamilyCommunities	68620
CY2012Q4	cpt	Total Number Of Apartment Homes In Multifamily Properties Upon Completion Of Development TotalNumberOfApartmentHomesInMultifamilyPropertiesUponCompletionOfDevelopment	2845
CY2011	cpt	Total Other Expenses TotalOtherExpenses	358268000	USD
CY2011Q4	cpt	Share Awards Held In Non Qualified Deferred Compensation Plan Shares ShareAwardsHeldInNonQualifiedDeferredCompensationPlanShares	900000	shares
CY2010	cpt	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost For Period ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostForPeriod	11700000	USD
CY2011	cpt	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost For Period ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostForPeriod	12300000	USD
CY2012	cpt	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost For Period ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostForPeriod	13700000	USD
CY2012Q4	cpt	Share Based Compensation Shares Authorized Under Stock Options Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price ShareBasedCompensationSharesAuthorizedUnderStockOptionsPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice	45.92
CY2010Q4	cpt	Share Based Compensation Shares Authorized Under Stock Options Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price ShareBasedCompensationSharesAuthorizedUnderStockOptionsPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePrice	42.37
CY2012Q4	cpt	Share Based Compensation Shares Authorized Under Stock Options Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price ShareBasedCompensationSharesAuthorizedUnderStockOptionsPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePrice	42.36
CY2011Q4	cpt	Share Based Compensation Shares Authorized Under Stock Options Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price ShareBasedCompensationSharesAuthorizedUnderStockOptionsPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePrice	42.27
CY2009Q4	cpt	Share Based Compensation Shares Authorized Under Stock Options Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price ShareBasedCompensationSharesAuthorizedUnderStockOptionsPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePrice	41.39
CY2012Q2	cpt	Shares Authorized SharesAuthorized	110000000	shares
CY2012Q2	cpt	Shares Authorized SharesAuthorized	185000000	shares
CY2011	cpt	Tax Recognized On Sale Of Available For Sale Investment TaxRecognizedOnSaleOfAvailableForSaleInvestment	1000000	USD
CY2010	cpt	Tax Treatment Of Dividends And Distributions Long Term Capital Gain TaxTreatmentOfDividendsAndDistributionsLongTermCapitalGain	0.20
CY2011	cpt	Tax Treatment Of Dividends And Distributions Long Term Capital Gain TaxTreatmentOfDividendsAndDistributionsLongTermCapitalGain	0.13
CY2012	cpt	Tax Treatment Of Dividends And Distributions Long Term Capital Gain TaxTreatmentOfDividendsAndDistributionsLongTermCapitalGain	0.64
CY2012	cpt	Tax Treatment Of Dividends And Distributions Ordinary Dividends TaxTreatmentOfDividendsAndDistributionsOrdinaryDividends	0.96
CY2010	cpt	Tax Treatment Of Dividends And Distributions Ordinary Dividends TaxTreatmentOfDividendsAndDistributionsOrdinaryDividends	0.89
CY2011	cpt	Tax Treatment Of Dividends And Distributions Ordinary Dividends TaxTreatmentOfDividendsAndDistributionsOrdinaryDividends	1.08
CY2011	cpt	Tax Treatment Of Dividends And Distributions Unrecaptured Section Twelve Hundred And Fifty Gain TaxTreatmentOfDividendsAndDistributionsUnrecapturedSectionTwelveHundredAndFiftyGain	0.23
CY2012	cpt	Tax Treatment Of Dividends And Distributions Unrecaptured Section Twelve Hundred And Fifty Gain TaxTreatmentOfDividendsAndDistributionsUnrecapturedSectionTwelveHundredAndFiftyGain	0.64
CY2010	cpt	Tax Treatment Of Dividends And Distributions Unrecaptured Section Twelve Hundred And Fifty Gain TaxTreatmentOfDividendsAndDistributionsUnrecapturedSectionTwelveHundredAndFiftyGain	0.48
CY2010	cpt	Tax Treatment Of Return Of Capital Per Common Share Distributions TaxTreatmentOfReturnOfCapitalPerCommonShareDistributions	0.23
CY2010	cpt	Total Other Expenses TotalOtherExpenses	358921000	USD
CY2012	cpt	Total Other Expenses TotalOtherExpenses	381694000	USD
CY2011Q4	cpt	Trading Securities Held In Employee Trust Value TradingSecuritiesHeldInEmployeeTrustValue	45200000	USD
CY2012Q4	cpt	Trading Securities Held In Employee Trust Value TradingSecuritiesHeldInEmployeeTrustValue	35700000	USD
CY2011Q4	cpt	Trading Securities Held In Non Qualified Deferred Compensation Plan Value TradingSecuritiesHeldInNonQualifiedDeferredCompensationPlanValue	14500000	USD
CY2012Q4	cpt	Trading Securities Held In Non Qualified Deferred Compensation Plan Value TradingSecuritiesHeldInNonQualifiedDeferredCompensationPlanValue	15200000	USD
CY2012	cpt	Weighted Average Fair Value Of Shares Purchased Under Employee Share Purchase Plan WeightedAverageFairValueOfSharesPurchasedUnderEmployeeSharePurchasePlan	67.80
CY2012Q4	cpt	Weighted Average Maturity Of Indebtedness Including Unsecured Line Of Credit WeightedAverageMaturityOfIndebtednessIncludingUnsecuredLineOfCredit	7.0	Y
CY2011	cpt	Write Off Of Original Issuance Costs Of Redeemed Perpetual Preferred Units WriteOffOfOriginalIssuanceCostsOfRedeemedPerpetualPreferredUnits	0	USD
CY2012Q4	cpt	Unamortized Value Of Above Or Below Market Leases UnamortizedValueOfAboveOrBelowMarketLeases	700000	USD
CY2011Q4	cpt	Unamortized Value Of Above Or Below Market Leases UnamortizedValueOfAboveOrBelowMarketLeases	0	USD
CY2012Q4	cpt	Value Of Real Estate Assets At Cost Subject To Secured Notes ValueOfRealEstateAssetsAtCostSubjectToSecuredNotes	1584700000	USD
CY2011Q4	cpt	Value Of Real Estate Assets At Cost Subject To Secured Notes ValueOfRealEstateAssetsAtCostSubjectToSecuredNotes	1651000000	USD
CY2011	cpt	Weighted Average Fair Value Of Shares Purchased Under Employee Share Purchase Plan WeightedAverageFairValueOfSharesPurchasedUnderEmployeeSharePurchasePlan	63.29
CY2010	cpt	Weighted Average Fair Value Of Shares Purchased Under Employee Share Purchase Plan WeightedAverageFairValueOfSharesPurchasedUnderEmployeeSharePurchasePlan	50.70
CY2012	cpt	Write Off Of Original Issuance Costs Of Redeemed Perpetual Preferred Units WriteOffOfOriginalIssuanceCostsOfRedeemedPerpetualPreferredUnits	2075000	USD
CY2010	cpt	Write Off Of Original Issuance Costs Of Redeemed Perpetual Preferred Units WriteOffOfOriginalIssuanceCostsOfRedeemedPerpetualPreferredUnits	0	USD
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0000906345
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	84482957	shares
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012Q2	dei	Entity Public Float EntityPublicFloat	5493647249	USD
CY2012	dei	Entity Registrant Name EntityRegistrantName	CAMDEN PROPERTY TRUST
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes

Files In Submission

Name	View Source	Status
0000906345-13-000003-index-headers.html	Edgar Link	pending
0000906345-13-000003-index.html	Edgar Link	pending
0000906345-13-000003.txt	Edgar Link	pending
0000906345-13-000003-xbrl.zip	Edgar Link	pending
camdenpropertytrusttotalretu.jpg	Edgar Link	pending
cpt-12312012x10k.htm	Edgar Link	pending
cpt-12312012xex121.htm	Edgar Link	pending
cpt-12312012xex211.htm	Edgar Link	pending
cpt-12312012xex231.htm	Edgar Link	pending
cpt-12312012xex241.htm	Edgar Link	pending
cpt-12312012xex311.htm	Edgar Link	pending
cpt-12312012xex312.htm	Edgar Link	pending
cpt-12312012xex321.htm	Edgar Link	pending
cpt-20121231.xml	Edgar Link	completed
cpt-20121231.xsd	Edgar Link	pending
cpt-20121231_cal.xml	Edgar Link	unprocessable
cpt-20121231_def.xml	Edgar Link	unprocessable
cpt-20121231_lab.xml	Edgar Link	unprocessable
cpt-20121231_pre.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
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R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$CPT
CAMDEN PROPERTY TRUST Stock $cpt

2012 Q4 Form 10-K Financial Statement

#000090634513000003 Filed on February 15, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CPT CAMDEN PROPERTY TRUST Stock $cpt

2012 Q4 Form 10-K Financial Statement

#000090634513000003 Filed on February 15, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CPT
CAMDEN PROPERTY TRUST Stock $cpt