$CPT
CAMDEN PROPERTY TRUST Stock $cpt

$cpt Overview Financials Valuation SEC Filings Company Website

2017 Q4 Form 10-K Financial Statement

#000090634518000007 Filed on February 16, 2018

Income Statement

Concept	2017 Q4	2017 Q3	2017
Revenue	$229.8M	$228.2M	$900.9M
YoY Change	5.84%	3.61%	2.79%
Cost Of Revenue	$87.70M	$95.50M	$328.7M
YoY Change	8.81%	9.9%	-3.4%
Gross Profit	$142.1M	$132.7M	$572.2M
YoY Change	4.1%	-0.52%	6.73%
Gross Profit Margin	61.83%	58.16%	63.51%
Selling, General & Admin	$13.00M	$12.30M	$50.60M
YoY Change	3.17%	13.89%	6.75%
% of Gross Profit	9.15%	9.27%	8.84%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$68.20M	$67.00M	$264.0M
YoY Change	8.77%	6.52%	5.53%
% of Gross Profit	47.99%	50.49%	46.14%
Operating Expenses	$78.80M	$77.10M	$306.5M
YoY Change	6.92%	7.08%	5.4%
Operating Profit	$63.30M	$55.60M	$265.7M
YoY Change	0.8%	-9.45%	8.3%
Interest Expense	-$17.20M	$21.21M	$86.75M
YoY Change	-15.27%	-8.09%	-6.87%
% of Operating Profit	-27.17%	38.15%	32.66%
Other Income/Expense, Net
YoY Change
Pretax Income	$89.30M	$35.99M	$202.1M
YoY Change	110.12%	-88.16%	-55.78%
Income Tax	$200.0K	$500.0K	$1.200M
% Of Pretax Income	0.22%	1.39%	0.59%
Net Earnings	$87.99M	$34.38M	$196.4M
YoY Change	115.17%	-88.18%	-76.04%
Net Earnings / Revenue	38.28%	15.07%	21.8%
Basic Earnings Per Share	$0.92	$0.38	$2.14
Diluted Earnings Per Share	$0.91	$0.38	$2.13
COMMON SHARES
Basic Shares Outstanding	92.68M shares	91.01M shares	91.50M shares
Diluted Shares Outstanding		92.03M shares	92.52M shares

Balance Sheet

Concept	2017 Q4	2017 Q3	2017
SHORT-TERM ASSETS
Cash & Short-Term Investments	$368.5M	$350.3M	$368.5M
YoY Change	55.22%	11.67%	55.22%
Cash & Equivalents	$368.5M	$350.3M	$368.5M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables	$24.00M	$23.60M	$24.00M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$392.5M	$373.9M	$392.5M
YoY Change	50.15%	10.72%	50.15%
LONG-TERM ASSETS
Property, Plant & Equipment	$5.549B	$5.568B	$5.549B
YoY Change	1.15%	1.82%	1.15%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$27.20M	$28.40M	$27.20M
YoY Change	-79.13%	-78.15%	-79.13%
Other Assets	$14.50M	$9.200M	$14.50M
YoY Change	59.34%	5.75%	59.34%
Total Long-Term Assets	$5.781B	$5.795B	$5.781B
YoY Change	0.25%	0.77%	0.25%
TOTAL ASSETS
Total Short-Term Assets	$392.5M	$373.9M	$392.5M
Total Long-Term Assets	$5.781B	$5.795B	$5.781B
Total Assets	$6.174B	$6.169B	$6.174B
YoY Change	2.42%	1.32%	2.41%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$128.3M	$127.6M	$128.3M
YoY Change	-6.89%	-10.89%	-6.89%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$0.00		$0.00
YoY Change
Total Short-Term Liabilities	$252.6M	$270.6M	$252.6M
YoY Change	-1.33%	-7.36%	-1.33%
LONG-TERM LIABILITIES
Long-Term Debt	$2.205B	$2.204B	$2.205B
YoY Change	-11.13%	-11.14%	-11.13%
Other Long-Term Liabilities	$231.8M	$227.5M	$231.8M
YoY Change	18.27%	16.97%	18.27%
Total Long-Term Liabilities	$2.436B	$2.432B	$2.436B
YoY Change	-8.97%	-9.09%	-8.97%
TOTAL LIABILITIES
Total Short-Term Liabilities	$252.6M	$270.6M	$252.6M
Total Long-Term Liabilities	$2.436B	$2.432B	$2.436B
Total Liabilities	$2.612B	$2.629B	$2.768B
YoY Change	-8.54%	-9.18%	-8.13%
SHAREHOLDERS EQUITY
Retained Earnings
YoY Change
Common Stock	$4.137B	$4.134B
YoY Change	12.48%	12.47%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$364.1M	$364.7M
YoY Change	-2.48%	-2.37%
Treasury Stock Shares	10.07M shares	10.09M shares
Shareholders Equity	$3.405B	$3.387B	$3.405B
YoY Change
Total Liabilities & Shareholders Equity	$6.174B	$6.169B	$6.174B
YoY Change	2.42%	1.32%	2.41%

Cashflow Statement

Concept	2017 Q4	2017 Q3	2017
OPERATING ACTIVITIES
Net Income	$87.99M	$34.38M	$196.4M
YoY Change	115.17%	-88.18%	-76.04%
Depreciation, Depletion And Amortization	$68.20M	$67.00M	$264.0M
YoY Change	8.77%	6.52%	5.53%
Cash From Operating Activities	$100.8M	$130.5M	$434.7M
YoY Change	17.76%	-3.62%	-1.9%
INVESTING ACTIVITIES
Capital Expenditures	-$79.30M	-$71.80M	-$299.1M
YoY Change	-1.25%	-31.09%	-12.8%
Acquisitions
YoY Change
Other Investing Activities	$69.50M	$800.0K	$2.187M
YoY Change	4864.29%	-99.79%	-169.19%
Cash From Investing Activities	-$9.800M	-$71.00M	-$189.8M
YoY Change	-87.59%	-126.13%	-127.48%
FINANCING ACTIVITIES
Cash Dividend Paid			$280.8M
YoY Change			-57.68%
Common Stock Issuance & Retirement, Net			$445.0M
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-72.70M	275.4M	-$112.9M
YoY Change	-12.62%	-161.49%	-87.51%
NET CHANGE
Cash From Operating Activities	100.8M	130.5M	$434.7M
Cash From Investing Activities	-9.800M	-71.00M	-$189.8M
Cash From Financing Activities	-72.70M	275.4M	-$112.9M
Net Change In Cash	18.30M	334.9M	$132.0M
YoY Change	-123.89%	-920.83%	-42.43%
FREE CASH FLOW
Cash From Operating Activities	$100.8M	$130.5M	$434.7M
Capital Expenditures	-$79.30M	-$71.80M	-$299.1M
Free Cash Flow	$180.1M	$202.3M	$733.8M
YoY Change	8.56%	-15.57%	-6.65%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2016Q4	cpt	Cash Required By Plan Participants Upon Withdrawal CashRequiredByPlanParticipantsUponWithdrawal	22700000	USD
CY2017Q4	cpt	Cash Required By Plan Participants Upon Withdrawal CashRequiredByPlanParticipantsUponWithdrawal	22300000	USD
CY2015	cpt	Change In Common Shareholders Equity And Net Transfers From Noncontrolling Interests ChangeInCommonShareholdersEquityAndNetTransfersFromNoncontrollingInterests	239921000	USD
CY2016	cpt	Change In Common Shareholders Equity And Net Transfers From Noncontrolling Interests ChangeInCommonShareholdersEquityAndNetTransfersFromNoncontrollingInterests	820113000	USD
CY2017	cpt	Change In Common Shareholders Equity And Net Transfers From Noncontrolling Interests ChangeInCommonShareholdersEquityAndNetTransfersFromNoncontrollingInterests	196539000	USD
CY2015	cpt	Accrual Associated With Construction And Capital Expenditures AccrualAssociatedWithConstructionAndCapitalExpenditures	24175000	USD
CY2016	cpt	Accrual Associated With Construction And Capital Expenditures AccrualAssociatedWithConstructionAndCapitalExpenditures	22762000	USD
CY2017	cpt	Accrual Associated With Construction And Capital Expenditures AccrualAssociatedWithConstructionAndCapitalExpenditures	19016000	USD
CY2017	cpt	Annual Dividend Distribution Percentage To Shareholders To Qualify As Real Estate Investment Trust AnnualDividendDistributionPercentageToShareholdersToQualifyAsRealEstateInvestmentTrust	0.90
CY2017Q4	cpt	Anticipated Expenditures Relating To Completion Of Construction Type Contracts AnticipatedExpendituresRelatingToCompletionOfConstructionTypeContracts	282300000	USD
CY2015	cpt	Capitalized Real Estate Taxes CapitalizedRealEstateTaxes	3600000	USD
CY2016	cpt	Capitalized Real Estate Taxes CapitalizedRealEstateTaxes	4500000	USD
CY2017	cpt	Capitalized Real Estate Taxes CapitalizedRealEstateTaxes	2400000	USD
CY2015	cpt	Changeinclassificationofdeferredcompensationplan Changeinclassificationofdeferredcompensationplan	-10999000	USD
CY2016	cpt	Changeinclassificationofdeferredcompensationplan Changeinclassificationofdeferredcompensationplan	-13956000	USD
CY2017	cpt	Changeinclassificationofdeferredcompensationplan Changeinclassificationofdeferredcompensationplan	-13388000	USD
CY2015	cpt	Common Share Options And Share Awards Granted CommonShareOptionsAndShareAwardsGranted	370000	shares
CY2016	cpt	Common Share Options And Share Awards Granted CommonShareOptionsAndShareAwardsGranted	323000	shares
CY2017	cpt	Common Share Options And Share Awards Granted CommonShareOptionsAndShareAwardsGranted	211000	shares
CY2016Q4	cpt	Common Shares Outstanding Including Treasury Shares CommonSharesOutstandingIncludingTreasuryShares	97818000	shares
CY2017Q4	cpt	Common Shares Outstanding Including Treasury Shares CommonSharesOutstandingIncludingTreasuryShares	102769000	shares
CY2016Q4	cpt	Common Stocks Value Outstanding CommonStocksValueOutstanding	978000	USD
CY2017Q4	cpt	Common Stocks Value Outstanding CommonStocksValueOutstanding	1028000	USD
CY2017Q4	cpt	Difference Between Carry Value Of Net Assets And Tax Basis Of Net Assets DifferenceBetweenCarryValueOfNetAssetsAndTaxBasisOfNetAssets	1300000000	USD
CY2015	cpt	Discontinuedoperationspropertyrevenueslesspropertyexpenses Discontinuedoperationspropertyrevenueslesspropertyexpenses	36594000	USD
CY2016	cpt	Discontinuedoperationspropertyrevenueslesspropertyexpenses Discontinuedoperationspropertyrevenueslesspropertyexpenses	12286000	USD
CY2016Q4	cpt	Distributions Payable DistributionsPayable	69161000	USD
CY2016	cpt	Diversificationofshareawardswithindeferredcompensationplan Equity DiversificationofshareawardswithindeferredcompensationplanEquity	25400000	USD
CY2015	cpt	Fees Earned For Property And Asset Management Construction Development And Other Services To Joint Ventures FeesEarnedForPropertyAndAssetManagementConstructionDevelopmentAndOtherServicesToJointVentures	5800000	USD
CY2016	cpt	Fees Earned For Property And Asset Management Construction Development And Other Services To Joint Ventures FeesEarnedForPropertyAndAssetManagementConstructionDevelopmentAndOtherServicesToJointVentures	5300000	USD
CY2017	cpt	Fees Earned For Property And Asset Management Construction Development And Other Services To Joint Ventures FeesEarnedForPropertyAndAssetManagementConstructionDevelopmentAndOtherServicesToJointVentures	5800000	USD
CY2017Q3	cpt	Hurricane Related Expensesperbasicshare HurricaneRelatedExpensesperbasicshare	0.05
CY2017Q3	cpt	Hurricanerelatedexpenses Hurricanerelatedexpenses	4987000	USD
CY2017Q3	cpt	Hurricanerelatedexpensesperdilutedshare Hurricanerelatedexpensesperdilutedshare	0.05
CY2017Q4	cpt	Distributions Payable DistributionsPayable	72943000	USD
CY2015	cpt	Diversificationofshareawardswithindeferredcompensationplan Equity DiversificationofshareawardswithindeferredcompensationplanEquity	3557000	USD
CY2016	cpt	Diversificationofshareawardswithindeferredcompensationplan Equity DiversificationofshareawardswithindeferredcompensationplanEquity	25428000	USD
CY2017	cpt	Diversificationofshareawardswithindeferredcompensationplan Equity DiversificationofshareawardswithindeferredcompensationplanEquity	23233000	USD
CY2017	cpt	Diversificationofshareawardswithindeferredcompensationplan Equity DiversificationofshareawardswithindeferredcompensationplanEquity	23200000	USD
CY2017	cpt	Employee Share Purchase Plan Maximum Authorized Amount Per Participant EmployeeSharePurchasePlanMaximumAuthorizedAmountPerParticipant	25000	USD
CY2017	cpt	Expected Useful Lives Of Intangible Assets Related To In Place Leases And Above And Below Market Leases ExpectedUsefulLivesOfIntangibleAssetsRelatedToInPlaceLeasesAndAboveAndBelowMarketLeases	underlying lease term
CY2015	cpt	Expense Benefit On Deferred Compensation Plans ExpenseBenefitOnDeferredCompensationPlans	-264000	USD
CY2016	cpt	Expense Benefit On Deferred Compensation Plans ExpenseBenefitOnDeferredCompensationPlans	5511000	USD
CY2017	cpt	Expense Benefit On Deferred Compensation Plans ExpenseBenefitOnDeferredCompensationPlans	16608000	USD
CY2015	cpt	Income From Discontinued Operations Including Gain IncomeFromDiscontinuedOperationsIncludingGain	19750000	USD
CY2016	cpt	Income From Discontinued Operations Including Gain IncomeFromDiscontinuedOperationsIncludingGain	382842000	USD
CY2017	cpt	Income From Discontinued Operations Including Gain IncomeFromDiscontinuedOperationsIncludingGain	0	USD
CY2015	cpt	Income Loss From Continuing Operations After Adjustment For Amount Allocated To Common Units IncomeLossFromContinuingOperationsAfterAdjustmentForAmountAllocatedToCommonUnits	227513000	USD
CY2016	cpt	Income Loss From Continuing Operations After Adjustment For Amount Allocated To Common Units IncomeLossFromContinuingOperationsAfterAdjustmentForAmountAllocatedToCommonUnits	430677000	USD
CY2017	cpt	Income Loss From Continuing Operations After Adjustment For Amount Allocated To Common Units IncomeLossFromContinuingOperationsAfterAdjustmentForAmountAllocatedToCommonUnits	196936000	USD
CY2015	cpt	Income Loss From Continuing Operations After Adjustment For Amount Allocated To Participating Securities IncomeLossFromContinuingOperationsAfterAdjustmentForAmountAllocatedToParticipatingSecurities	227513000	USD
CY2016	cpt	Income Loss From Continuing Operations After Adjustment For Amount Allocated To Participating Securities IncomeLossFromContinuingOperationsAfterAdjustmentForAmountAllocatedToParticipatingSecurities	430677000	USD
CY2017	cpt	Income Loss From Continuing Operations After Adjustment For Amount Allocated To Participating Securities IncomeLossFromContinuingOperationsAfterAdjustmentForAmountAllocatedToParticipatingSecurities	195762000	USD
CY2015	cpt	Income Loss On Deferred Compensation Plans IncomeLossOnDeferredCompensationPlans	-264000	USD
CY2016	cpt	Income Loss On Deferred Compensation Plans IncomeLossOnDeferredCompensationPlans	5511000	USD
CY2017	cpt	Income Loss On Deferred Compensation Plans IncomeLossOnDeferredCompensationPlans	16608000	USD
CY2016Q2	cpt	Incomelossduetodispositionofoperatingpropertyperbasicshare Incomelossduetodispositionofoperatingpropertyperbasicshare	0.36
CY2016Q3	cpt	Incomelossduetodispositionofoperatingpropertyperbasicshare Incomelossduetodispositionofoperatingpropertyperbasicshare	2.93
CY2017Q4	cpt	Incomelossduetodispositionofoperatingpropertyperbasicshare Incomelossduetodispositionofoperatingpropertyperbasicshare	0.46
CY2016Q2	cpt	Incomelossduetodispositionofoperatingpropertyperdilutedshare Incomelossduetodispositionofoperatingpropertyperdilutedshare	0.36
CY2016Q3	cpt	Incomelossduetodispositionofoperatingpropertyperdilutedshare Incomelossduetodispositionofoperatingpropertyperdilutedshare	2.92
CY2017Q4	cpt	Incomelossduetodispositionofoperatingpropertyperdilutedshare Incomelossduetodispositionofoperatingpropertyperdilutedshare	0.45
CY2017Q4	cpt	Maximum Investmentsby Formed Unconsolidated Joint Venture MaximumInvestmentsbyFormedUnconsolidatedJointVenture	450000000	USD
CY2015	cpt	Net Income Attributable To Common Shareholders And Noncontrolling Interests NetIncomeAttributableToCommonShareholdersAndNoncontrollingInterests	258262000	USD
CY2016	cpt	Net Income Attributable To Common Shareholders And Noncontrolling Interests NetIncomeAttributableToCommonShareholdersAndNoncontrollingInterests	838226000	USD
CY2017	cpt	Net Income Attributable To Common Shareholders And Noncontrolling Interests NetIncomeAttributableToCommonShareholdersAndNoncontrollingInterests	200860000	USD
CY2016Q4	cpt	Net Operating Real Estate Assets NetOperatingRealEstateAssets	5043742000	USD
CY2017Q4	cpt	Net Operating Real Estate Assets NetOperatingRealEstateAssets	5171673000	USD
CY2015	cpt	Noncontrolling Interest Increase From Equity Upon Conversion Of Operating Partnership Unit NoncontrollingInterestIncreaseFromEquityUponConversionOfOperatingPartnershipUnit	86000	USD
CY2016	cpt	Noncontrolling Interest Increase From Equity Upon Conversion Of Operating Partnership Unit NoncontrollingInterestIncreaseFromEquityUponConversionOfOperatingPartnershipUnit	290000	USD
CY2017	cpt	Noncontrolling Interest Increase From Equity Upon Conversion Of Operating Partnership Unit NoncontrollingInterestIncreaseFromEquityUponConversionOfOperatingPartnershipUnit	117000	USD
CY2015	cpt	Number Of Joint Ventures Accounted For Under Equity Method Investments NumberOfJointVenturesAccountedForUnderEquityMethodInvestments	3
CY2016	cpt	Number Of Joint Ventures Accounted For Under Equity Method Investments NumberOfJointVenturesAccountedForUnderEquityMethodInvestments	3
CY2017	cpt	Number Of Joint Ventures Accounted For Under Equity Method Investments NumberOfJointVenturesAccountedForUnderEquityMethodInvestments	3
CY2017Q4	cpt	Number Of Multifamily Communities NumberOfMultifamilyCommunities	162
CY2016	cpt	Proceedsfromsaleofoperatingpropertiesincludingland Proceedsfromsaleofoperatingpropertiesincludingland	515754000	USD
CY2017	cpt	Proceedsfromsaleofoperatingpropertiesincludingland Proceedsfromsaleofoperatingpropertiesincludingland	76902000	USD
CY2017	cpt	Percentage Of Market Valueat Which Shares Purchased Under Employee Share Purchase Plan PercentageOfMarketValueatWhichSharesPurchasedUnderEmployeeSharePurchasePlan	0.85
CY2015	cpt	Percentage Of Rental Revenue And Other Income From Leasing Of Apartment Homes PercentageOfRentalRevenueAndOtherIncomeFromLeasingOfApartmentHomes	0.99
CY2017Q4	cpt	Number Of Multifamily Properties Under Development NumberOfMultifamilyPropertiesUnderDevelopment	7
CY2017	cpt	Numberof Operatingproperties Acquired NumberofOperatingpropertiesAcquired	1
CY2017Q4	cpt	Numberofconsolidatedprojectsunderconstruction Numberofconsolidatedprojectsunderconstruction	7
CY2016	cpt	Participant Withdrawals From Deferred Compensation Plan Investments ParticipantWithdrawalsFromDeferredCompensationPlanInvestments	8300000	USD
CY2017	cpt	Participant Withdrawals From Deferred Compensation Plan Investments ParticipantWithdrawalsFromDeferredCompensationPlanInvestments	4200000	USD
CY2016	cpt	Percentage Of Rental Revenue And Other Income From Leasing Of Apartment Homes PercentageOfRentalRevenueAndOtherIncomeFromLeasingOfApartmentHomes	0.99
CY2017	cpt	Percentage Of Rental Revenue And Other Income From Leasing Of Apartment Homes PercentageOfRentalRevenueAndOtherIncomeFromLeasingOfApartmentHomes	0.99
CY2015	cpt	Proceedsfromsaleofoperatingpropertiesincludingland Proceedsfromsaleofoperatingpropertiesincludingland	145044000	USD
CY2016Q4	cpt	Properties Under Development Including Land PropertiesUnderDevelopmentIncludingLand	442292000	USD
CY2017Q4	cpt	Properties Under Development Including Land PropertiesUnderDevelopmentIncludingLand	377231000	USD
CY2015	cpt	Property Management Expense Discontinued Operations PropertyManagementExpenseDiscontinuedOperations	706000	USD
CY2016	cpt	Property Management Expense Discontinued Operations PropertyManagementExpenseDiscontinuedOperations	242000	USD
CY2017Q4	cpt	Real Estate And Accumulated Depreciation Total Cost Of Real Estate Assets Net Of Accumulated Depreciation RealEstateAndAccumulatedDepreciationTotalCostOfRealEstateAssetsNetOfAccumulatedDepreciation	5548904000	USD
CY2016Q4	cpt	Real Estate Assets At Cost Total RealEstateAssetsAtCostTotal	6934398000	USD
CY2017Q4	cpt	Real Estate Assets At Cost Total RealEstateAssetsAtCostTotal	7290512000	USD
CY2016Q4	cpt	Real Estate Assets Total RealEstateAssetsTotal	5516288000	USD
CY2017Q4	cpt	Real Estate Assets Total RealEstateAssetsTotal	5576141000	USD
CY2015	cpt	Real Estate Development RealEstateDevelopment	347429000	USD
CY2016	cpt	Real Estate Development RealEstateDevelopment	278447000	USD
CY2017	cpt	Real Estate Development RealEstateDevelopment	224202000	USD
CY2015	cpt	Reclassificationofnetlossoncashflowhedgingactivitiespriorservicecostandnetlossonpostretirementobligation Reclassificationofnetlossoncashflowhedgingactivitiespriorservicecostandnetlossonpostretirementobligation	149000	USD
CY2016	cpt	Reclassificationofnetlossoncashflowhedgingactivitiespriorservicecostandnetlossonpostretirementobligation Reclassificationofnetlossoncashflowhedgingactivitiespriorservicecostandnetlossonpostretirementobligation	130000	USD
CY2017	cpt	Reclassificationofnetlossoncashflowhedgingactivitiespriorservicecostandnetlossonpostretirementobligation Reclassificationofnetlossoncashflowhedgingactivitiespriorservicecostandnetlossonpostretirementobligation	136000	USD
CY2016Q4	cpt	Share Awards Held In Employee Trust Shares ShareAwardsHeldInEmployeeTrustShares	1800000	shares
CY2017Q4	cpt	Share Awards Held In Employee Trust Shares ShareAwardsHeldInEmployeeTrustShares	1700000	shares
CY2016Q4	cpt	Share Awards Held In Non Qualified Deferred Compensation Plan Shares ShareAwardsHeldInNonQualifiedDeferredCompensationPlanShares	1100000	shares
CY2017Q4	cpt	Share Awards Held In Non Qualified Deferred Compensation Plan Shares ShareAwardsHeldInNonQualifiedDeferredCompensationPlanShares	1000000	shares
CY2015	cpt	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost For Period ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostForPeriod	18600000	USD
CY2016	cpt	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost For Period ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostForPeriod	21300000	USD
CY2017	cpt	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost For Period ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostForPeriod	18800000	USD
CY2017Q4	cpt	Shares Authorized SharesAuthorized	185000000	shares
CY2016	cpt	Sharesdiversified Sharesdiversified	297000	shares
CY2017	cpt	Sharesdiversified Sharesdiversified	261000	shares
CY2016Q3	cpt	Special Dividend Per Share SpecialDividendPerShare	4.25
CY2015	cpt	Tax Treatment Of Dividends And Distributions Long Term Capital Gain TaxTreatmentOfDividendsAndDistributionsLongTermCapitalGain	0.70
CY2016	cpt	Tax Treatment Of Dividends And Distributions Long Term Capital Gain TaxTreatmentOfDividendsAndDistributionsLongTermCapitalGain	5.02
CY2017	cpt	Tax Treatment Of Dividends And Distributions Long Term Capital Gain TaxTreatmentOfDividendsAndDistributionsLongTermCapitalGain	0.41
CY2015	cpt	Tax Treatment Of Dividends And Distributions Ordinary Dividends TaxTreatmentOfDividendsAndDistributionsOrdinaryDividends	1.88
CY2016	cpt	Tax Treatment Of Dividends And Distributions Ordinary Dividends TaxTreatmentOfDividendsAndDistributionsOrdinaryDividends	0.00
CY2017	cpt	Tax Treatment Of Dividends And Distributions Ordinary Dividends TaxTreatmentOfDividendsAndDistributionsOrdinaryDividends	2.38
CY2015	cpt	Tax Treatment Of Dividends And Distributions Unrecaptured Section Twelve Hundred And Fifty Gain TaxTreatmentOfDividendsAndDistributionsUnrecapturedSectionTwelveHundredAndFiftyGain	0.22
CY2016	cpt	Tax Treatment Of Dividends And Distributions Unrecaptured Section Twelve Hundred And Fifty Gain TaxTreatmentOfDividendsAndDistributionsUnrecapturedSectionTwelveHundredAndFiftyGain	2.23
CY2017	cpt	Tax Treatment Of Dividends And Distributions Unrecaptured Section Twelve Hundred And Fifty Gain TaxTreatmentOfDividendsAndDistributionsUnrecapturedSectionTwelveHundredAndFiftyGain	0.21
CY2015	cpt	Total Non Property Income Loss TotalNonPropertyIncomeLoss	7332000	USD
CY2016	cpt	Total Non Property Income Loss TotalNonPropertyIncomeLoss	14577000	USD
CY2017	cpt	Total Non Property Income Loss TotalNonPropertyIncomeLoss	27795000	USD
CY2017Q4	cpt	Total Number Of Apartment Homes In Multifamily Communities TotalNumberOfApartmentHomesInMultifamilyCommunities	55143
CY2017Q4	cpt	Total Number Of Apartment Homes In Multifamily Properties Upon Completion Of Development TotalNumberOfApartmentHomesInMultifamilyPropertiesUponCompletionOfDevelopment	2110
CY2015	cpt	Total Other Expenses TotalOtherExpenses	412022000	USD
CY2016	cpt	Total Other Expenses TotalOtherExpenses	425190000	USD
CY2017	cpt	Total Other Expenses TotalOtherExpenses	447595000	USD
CY2016Q4	cpt	Trading Securities Held In Employee Trust Value TradingSecuritiesHeldInEmployeeTrustValue	34500000	USD
CY2017Q4	cpt	Trading Securities Held In Employee Trust Value TradingSecuritiesHeldInEmployeeTrustValue	26700000	USD
CY2016Q4	cpt	Trading Securities Held In Non Qualified Deferred Compensation Plan Value TradingSecuritiesHeldInNonQualifiedDeferredCompensationPlanValue	59500000	USD
CY2017Q4	cpt	Trading Securities Held In Non Qualified Deferred Compensation Plan Value TradingSecuritiesHeldInNonQualifiedDeferredCompensationPlanValue	93600000	USD
CY2016Q4	cpt	Value Of Real Estate Assets At Cost Subject To Secured Notes ValueOfRealEstateAssetsAtCostSubjectToSecuredNotes	1598900000	USD
CY2017Q4	cpt	Value Of Real Estate Assets At Cost Subject To Secured Notes ValueOfRealEstateAssetsAtCostSubjectToSecuredNotes	1534900000	USD
CY2015	cpt	Weighted Average Fair Value Of Shares Purchased Under Employee Share Purchase Plan WeightedAverageFairValueOfSharesPurchasedUnderEmployeeSharePurchasePlan	74.66
CY2016	cpt	Weighted Average Fair Value Of Shares Purchased Under Employee Share Purchase Plan WeightedAverageFairValueOfSharesPurchasedUnderEmployeeSharePurchasePlan	82.33
CY2017	cpt	Weighted Average Fair Value Of Shares Purchased Under Employee Share Purchase Plan WeightedAverageFairValueOfSharesPurchasedUnderEmployeeSharePurchasePlan	89.89
CY2017Q4	cpt	Weighted Average Maturity Of Indebtedness Including Unsecured Line Of Credit WeightedAverageMaturityOfIndebtednessIncludingUnsecuredLineOfCredit	4.3	Y
CY2017	dei	Amendment Flag AmendmentFlag	false
CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-12-31
CY2017	dei	Document Type DocumentType	10-K
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0000906345
CY2018Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	92720729	shares
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2017Q2	dei	Entity Public Float EntityPublicFloat	7420664859	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	CAMDEN PROPERTY TRUST
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2016Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	137813000	USD
CY2017Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	128313000	USD
CY2016Q4	us-gaap	Accounts Receivable Related Parties AccountsReceivableRelatedParties	24028000	USD
CY2017Q4	us-gaap	Accounts Receivable Related Parties AccountsReceivableRelatedParties	24038000	USD
CY2016Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current And Noncurrent AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent	49041000	USD
CY2017Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current And Noncurrent AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent	51383000	USD
CY2016Q4	us-gaap	Accumulated Distributions In Excess Of Net Income AccumulatedDistributionsInExcessOfNetIncome	289180000	USD
CY2017Q4	us-gaap	Accumulated Distributions In Excess Of Net Income AccumulatedDistributionsInExcessOfNetIncome	368703000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1863000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-57000	USD
CY2015	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P8M
CY2017	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P6M
CY2016Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	3678277000	USD
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	4137161000	USD
CY2015	us-gaap	Amortization Of Below Market Lease AmortizationOfBelowMarketLease	100000	USD
CY2015	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	500000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1300000	USD
CY2015	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2600000	shares
CY2016	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2400000	shares
CY2017	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1500000	shares
CY2016Q4	us-gaap	Area Of Land AreaOfLand	4.6	acre
CY2017Q2	us-gaap	Area Of Land AreaOfLand	8.2	acre
CY2015	us-gaap	Asset Management Costs AssetManagementCosts	4742000	USD
CY2016	us-gaap	Asset Management Costs AssetManagementCosts	3848000	USD
CY2017	us-gaap	Asset Management Costs AssetManagementCosts	3903000	USD
CY2016Q4	us-gaap	Assets Assets	6028152000	USD
CY2017Q4	us-gaap	Assets Assets	6173748000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	10617000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	237364000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	368492000	USD
CY2014Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	159816000	USD
CY2015Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	16588000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	245826000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	377805000	USD
CY2015	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-143228000	USD
CY2016	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	229238000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	131979000	USD
CY2015	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	-13775000	USD
CY2016	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	-1890000	USD
CY2017	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	0	USD
CY2015	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	35938000	USD
CY2016	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	12594000	USD
CY2017	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	0	USD
CY2016Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2017Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2015	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.80
CY2016	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	7.25
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	3.00
CY2016Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	175000000	shares
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	175000000	shares
CY2016Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	100694000	shares
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	105489000	shares
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	92700000	shares
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	249821000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	819873000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	198228000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	258768000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	838276000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	202666000	USD
CY2015	us-gaap	Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Changes Purchase Of Interest By Parent ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent	9480000	USD
CY2016	us-gaap	Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Changes Purchase Of Interest By Parent ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent	0	USD
CY2017	us-gaap	Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Changes Purchase Of Interest By Parent ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent	0	USD
CY2015	us-gaap	Cost Of Real Estate Revenue CostOfRealEstateRevenue	301000000	USD
CY2016	us-gaap	Cost Of Real Estate Revenue CostOfRealEstateRevenue	311355000	USD
CY2017	us-gaap	Cost Of Real Estate Revenue CostOfRealEstateRevenue	328742000	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1872000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1617000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1224000	USD
CY2016Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	15700000	USD
CY2017Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	12300000	USD
CY2017Q4	us-gaap	Debt Weighted Average Interest Rate DebtWeightedAverageInterestRate	0.043
CY2016Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	80600000	USD
CY2017Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	120300000	USD
CY2017Q4	us-gaap	Deferred Tax Liability Not Recognized Amount Of Unrecognized Deferred Tax Liability Undistributed Earnings Of Domestic Subsidiaries DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfDomesticSubsidiaries	0	USD
CY2015	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2600000	USD
CY2016	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2700000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2700000	USD
CY2015	us-gaap	Depreciation And Amortization DepreciationAndAmortization	240944000	USD
CY2016	us-gaap	Depreciation And Amortization DepreciationAndAmortization	250146000	USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	263974000	USD
CY2015	us-gaap	Depreciation And Amortization Discontinued Operations DepreciationAndAmortizationDiscontinuedOperations	16138000	USD
CY2016	us-gaap	Depreciation And Amortization Discontinued Operations DepreciationAndAmortizationDiscontinuedOperations	4327000	USD
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	240944000	USD
CY2016	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	250146000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	263974000	USD
CY2017Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	500000	USD
CY2016	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	0	USD
CY2017Q1	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	0	USD
CY2017	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	1174000	USD
CY2015	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	202105000	USD
CY2016	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	206780000	USD
CY2017	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	217817000	USD
CY2015	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2016	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	375237000	USD
CY2017	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2015	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	19750000	USD
CY2016	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	7605000	USD
CY2017	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	0	USD
CY2015	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0.22
CY2016	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	4.27
CY2017	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0.00
CY2015	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0.22
CY2016	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	4.26
CY2017	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0.00
CY2015	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Discontinued Operation During Phase Out Period DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod	0	USD
CY2016	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Discontinued Operation During Phase Out Period DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod	112000	USD
CY2015	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	20716000	USD
CY2016	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	6898000	USD
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.23
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.45
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	9.08
CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.39
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.43
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.38
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.92
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.14
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.76
CY2015	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	57310000	USD
CY2016	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	19184000	USD
CY2015	us-gaap	Dividends Dividends	64275000	USD
CY2016	us-gaap	Dividends Dividends	69161000	USD
CY2017	us-gaap	Dividends Dividends	72943000	USD
CY2015	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	257059000	USD
CY2016	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	668470000	USD
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	284631000	USD
CY2017Q4	us-gaap	Earnest Money Deposits EarnestMoneyDeposits	5200000	USD
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.77
CY2016Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.46
CY2016Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.94
CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.46
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CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.21
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.45
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	9.05
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.39
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.43
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.38
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.91
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.13
CY2015	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	3500000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	3800000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	3800000	USD
CY2015	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	200000	USD
CY2016	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	400000	USD
CY2017	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	300000	USD
CY2015	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	6387000	USD
CY2016	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	7057000	USD
CY2017	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	6851000	USD
CY2016Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	726900000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	715900000	USD
CY2016Q4	us-gaap	Equity Method Investment Summarized Financial Information Equity Or Capital EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital	184000000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Equity Or Capital EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital	174500000	USD
CY2016Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities EquityMethodInvestmentSummarizedFinancialInformationLiabilities	518700000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities EquityMethodInvestmentSummarizedFinancialInformationLiabilities	514500000	USD
CY2015	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	12000000	USD
CY2016	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	14800000	USD
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	13500000	USD
CY2015	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	114500000	USD
CY2016	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	119800000	USD
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	121900000	USD
CY2015	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	104288000	USD
CY2016	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	295397000	USD
CY2017	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	43231000	USD
CY2015	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	104288000	USD
CY2016	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	295397000	USD
CY2017	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	43231000	USD
CY2016Q2	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	32235000	USD
CY2016Q3	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	262719000	USD
CY2015	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2016	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
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CY2015	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	46233000	USD
CY2016	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	47415000	USD
CY2017	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	50587000	USD
CY2017Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	0	USD
CY2015	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	229565000	USD
CY2016	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	436981000	USD
CY2017	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	196422000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	240384000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	457001000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	202084000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	238512000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	455384000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	200860000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.55
CY2016	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	4.81
CY2017	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.14
CY2015	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.54
CY2016	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	4.79
CY2017	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.13
CY2015	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	19750000	USD
CY2016	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	382842000	USD
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2015	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	6168000	USD
CY2016	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	7125000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	6822000	USD
CY2015	us-gaap	Income Taxes Paid IncomeTaxesPaid	1889000	USD
CY2016	us-gaap	Income Taxes Paid IncomeTaxesPaid	2424000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	1705000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-15478000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-2309000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-2300000	USD
CY2015	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	5761000	USD
CY2016	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	-281000	USD
CY2017	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	4846000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1687000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	3551000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	6724000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	2245000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-2361000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-995000	USD
CY2015	us-gaap	Increase Decrease In Property And Other Taxes Payable IncreaseDecreaseInPropertyAndOtherTaxesPayable	6386000	USD
CY2016	us-gaap	Increase Decrease In Property And Other Taxes Payable IncreaseDecreaseInPropertyAndOtherTaxesPayable	5526000	USD
CY2017	us-gaap	Increase Decrease In Property And Other Taxes Payable IncreaseDecreaseInPropertyAndOtherTaxesPayable	2342000	USD
CY2016	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	0	shares
CY2017Q1	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	0	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	805000	shares
CY2015	us-gaap	Interest And Other Income InterestAndOtherIncome	597000	USD
CY2016	us-gaap	Interest And Other Income InterestAndOtherIncome	2202000	USD
CY2017	us-gaap	Interest And Other Income InterestAndOtherIncome	3011000	USD
CY2015	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	19300000	USD
CY2016	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	18200000	USD
CY2017	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	15200000	USD
CY2015	us-gaap	Interest Expense InterestExpense	97312000	USD
CY2016	us-gaap	Interest Expense InterestExpense	93145000	USD
CY2017	us-gaap	Interest Expense InterestExpense	86750000	USD
CY2015	us-gaap	Interest Paid Net InterestPaidNet	96179000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	93302000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	88654000	USD
CY2016Q4	us-gaap	Interest Rate Derivative Assets At Fair Value InterestRateDerivativeAssetsAtFairValue	0	USD
CY2017Q4	us-gaap	Interest Rate Derivative Assets At Fair Value InterestRateDerivativeAssetsAtFairValue	2200000	USD
CY2016Q4	us-gaap	Interest Rate Derivative Liabilities At Fair Value InterestRateDerivativeLiabilitiesAtFairValue	0	USD
CY2017Q4	us-gaap	Interest Rate Derivative Liabilities At Fair Value InterestRateDerivativeLiabilitiesAtFairValue	500000	USD
CY2016Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	5967023000	USD
CY2017Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	6269481000	USD
CY2016Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	30254000	USD
CY2017Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	27237000	USD
CY2016Q4	us-gaap	Land Land	967375000	USD
CY2017Q4	us-gaap	Land Land	1021031000	USD
CY2015	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	3400000	USD
CY2016	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	4100000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	4000000	USD
CY2016Q4	us-gaap	Liabilities Liabilities	2855562000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	2611804000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6028152000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6173748000	USD
CY2016Q4	us-gaap	Liabilities Fair Value Disclosure Nonrecurring LiabilitiesFairValueDisclosureNonrecurring	0	USD
CY2017Q4	us-gaap	Liabilities Fair Value Disclosure Nonrecurring LiabilitiesFairValueDisclosureNonrecurring	0	USD
CY2017Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	586600000	USD
CY2017Q4	us-gaap	Long Term Debt LongTermDebt	2204600000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	790700000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	173700000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	349300000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	249100000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	-1200000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	643000000	USD
CY2015	us-gaap	Management Fees Revenue ManagementFeesRevenue	6999000	USD
CY2016	us-gaap	Management Fees Revenue ManagementFeesRevenue	6864000	USD
CY2017	us-gaap	Management Fees Revenue ManagementFeesRevenue	8176000	USD
CY2016Q4	us-gaap	Minority Interest MinorityInterest	80680000	USD
CY2017Q4	us-gaap	Minority Interest MinorityInterest	79351000	USD
CY2015	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	9500000	USD
CY2016	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	0	USD
CY2017	us-gaap	Mortgage Loan On Real Estate Final Maturity Date MortgageLoanOnRealEstateFinalMaturityDate	2030-10-01
CY2014Q4	us-gaap	Mortgage Loans On Real Estate Carrying Amount Of Mortgages MortgageLoansOnRealEstateCarryingAmountOfMortgages	3395000	USD
CY2015Q4	us-gaap	Mortgage Loans On Real Estate Carrying Amount Of Mortgages MortgageLoansOnRealEstateCarryingAmountOfMortgages	13161000	USD
CY2016Q4	us-gaap	Mortgage Loans On Real Estate Carrying Amount Of Mortgages MortgageLoansOnRealEstateCarryingAmountOfMortgages	17200000	USD
CY2016Q4	us-gaap	Mortgage Loans On Real Estate Carrying Amount Of Mortgages MortgageLoansOnRealEstateCarryingAmountOfMortgages	17224000	USD
CY2017Q4	us-gaap	Mortgage Loans On Real Estate Carrying Amount Of Mortgages MortgageLoansOnRealEstateCarryingAmountOfMortgages	18790000	USD
CY2015	us-gaap	Mortgage Loans On Real Estate Collections Of Principal MortgageLoansOnRealEstateCollectionsOfPrincipal	0	USD
CY2016	us-gaap	Mortgage Loans On Real Estate Collections Of Principal MortgageLoansOnRealEstateCollectionsOfPrincipal	-3395000	USD
CY2017	us-gaap	Mortgage Loans On Real Estate Collections Of Principal MortgageLoansOnRealEstateCollectionsOfPrincipal	0	USD
CY2017Q4	us-gaap	Mortgage Loans On Real Estate Federal Income Tax Basis1 MortgageLoansOnRealEstateFederalIncomeTaxBasis1	18790000	USD
CY2016	us-gaap	Mortgage Loans On Real Estate Interest Rate MortgageLoansOnRealEstateInterestRate	0.040
CY2017	us-gaap	Mortgage Loans On Real Estate Interest Rate MortgageLoansOnRealEstateInterestRate	0.040
CY2015	us-gaap	Mortgage Loans On Real Estate New Mortgage Loans MortgageLoansOnRealEstateNewMortgageLoans	9766000	USD
CY2016	us-gaap	Mortgage Loans On Real Estate New Mortgage Loans MortgageLoansOnRealEstateNewMortgageLoans	7458000	USD
CY2017	us-gaap	Mortgage Loans On Real Estate New Mortgage Loans MortgageLoansOnRealEstateNewMortgageLoans	1566000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-273231000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-904237000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-112923000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-293235000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	690412000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-189754000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-279460000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	69320000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-189754000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	423238000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	443063000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	434656000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	387300000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	430469000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	434656000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	249315000	USD
CY2016Q1	us-gaap	Net Income Loss NetIncomeLoss	41730000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	6700000	USD
CY2015	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	721816000	USD
CY2016	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	750597000	USD
CY2017	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	770540000	USD
CY2016Q4	us-gaap	Other Assets OtherAssets	142010000	USD
CY2017Q4	us-gaap	Other Assets OtherAssets	195764000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	506000	USD
CY2016Q2	us-gaap	Net Income Loss NetIncomeLoss	446302000	USD
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	290898000	USD
CY2016Q4	us-gaap	Net Income Loss NetIncomeLoss	40893000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	819823000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	34861000	USD
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	39188000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	34384000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	87989000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	196422000	USD
CY2015	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	8947000	USD
CY2016	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	18403000	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	4438000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	247263000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	813519000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	195762000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	247263000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	813519000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	196936000	USD
CY2017	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Description NewAccountingPronouncementOrChangeInAccountingPrincipleDescription	21.9
CY2015	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	9500000	USD
CY2016	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	0	USD
CY2017	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	0	USD
CY2016Q4	us-gaap	Notes Payable NotesPayable	2480600000	USD
CY2017Q4	us-gaap	Notes Payable NotesPayable	2204600000	USD
CY2017Q2	us-gaap	Number Of Units In Real Estate Property NumberOfUnitsInRealEstateProperty	250
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	2900000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	2600000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	2800000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	2800000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	2800000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	50000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1806000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-357000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	80000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	20000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	0	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	1690000	USD
CY2015	us-gaap	Payments Of Dividends PaymentsOfDividends	253129000	USD
CY2016Q4	us-gaap	Other Liabilities OtherLiabilities	118959000	USD
CY2017Q4	us-gaap	Other Liabilities OtherLiabilities	154567000	USD
CY2015	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-2773000	USD
CY2016	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-2976000	USD
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-2831000	USD
CY2015	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-5761000	USD
CY2016	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	281000	USD
CY2017	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-4846000	USD
CY2015	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	113802000	USD
CY2016	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	125850000	USD
CY2017	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	130356000	USD
CY2015	us-gaap	Owned Property Management Costs OwnedPropertyManagementCosts	23055000	USD
CY2016	us-gaap	Owned Property Management Costs OwnedPropertyManagementCosts	25125000	USD
CY2017	us-gaap	Owned Property Management Costs OwnedPropertyManagementCosts	25773000	USD
CY2015	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	2052000	USD
CY2016	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	6304000	USD
CY2017	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	660000	USD
CY2015	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	12705000	USD
CY2016	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	3482000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	9303000	USD
CY2016	us-gaap	Payments Of Dividends PaymentsOfDividends	663363000	USD
CY2017	us-gaap	Payments Of Dividends PaymentsOfDividends	280761000	USD
CY2017Q2	us-gaap	Payments To Acquire Land PaymentsToAcquireLand	20000000	USD
CY2016	us-gaap	Payments To Acquire Land PaymentsToAcquireLand	19900000	USD
CY2015	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	0	USD
CY2016	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	0	USD
CY2017	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	58267000	USD
CY2015	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	0	USD
CY2016	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	100000000	USD
CY2017	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	0	USD
CY2015	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	411799000	USD
CY2016	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	342952000	USD
CY2017	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	299086000	USD
CY2017Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	10000000	shares
CY2017Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2017	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	500000	USD
CY2015	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2016	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	445038000	USD
CY2015	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	18336000	USD
CY2016	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	19006000	USD
CY2017	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	18061000	USD
CY2015	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	1466000000	USD
CY2016	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	1305000000	USD
CY2017	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	465000000	USD
CY2015	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1559000	USD
CY2016	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	6203000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	1799000	USD
CY2015	us-gaap	Proceeds From Sale Of Property Held For Sale ProceedsFromSaleOfPropertyHeldForSale	0	USD
CY2016	us-gaap	Proceeds From Sale Of Property Held For Sale ProceedsFromSaleOfPropertyHeldForSale	622982000	USD
CY2017	us-gaap	Proceeds From Sale Of Property Held For Sale ProceedsFromSaleOfPropertyHeldForSale	0	USD
CY2015	us-gaap	Proceeds From Short Term Debt Maturing In Three Months Or Less ProceedsFromShortTermDebtMaturingInThreeMonthsOrLess	0	USD
CY2016	us-gaap	Proceeds From Short Term Debt Maturing In Three Months Or Less ProceedsFromShortTermDebtMaturingInThreeMonthsOrLess	0	USD
CY2017	us-gaap	Proceeds From Short Term Debt Maturing In Three Months Or Less ProceedsFromShortTermDebtMaturingInThreeMonthsOrLess	100000000	USD
CY2015	us-gaap	Profit Loss ProfitLoss	258262000	USD
CY2016	us-gaap	Profit Loss ProfitLoss	838226000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	200860000	USD
CY2014Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1557004000	USD
CY2015Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1780694000	USD
CY2016Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1890656000	USD
CY2017Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	2118839000	USD
CY2015	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	10265000	USD
CY2016	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	133441000	USD
CY2017	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	27741000	USD
CY2017Q4	us-gaap	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	865970000	USD
CY2017Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements	6666394000	USD
CY2017Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land RealEstateAndAccumulatedDepreciationCarryingAmountOfLand	1001349000	USD
CY2017Q4	us-gaap	Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements	823548000	USD
CY2017Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements	5842846000	USD
CY2017Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Land RealEstateAndAccumulatedDepreciationInitialCostOfLand	1001349000	USD
CY2015	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	24705000	USD
CY2016	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	355246000	USD
CY2017	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	62023000	USD
CY2017Q4	us-gaap	Real Estate Federal Income Tax Basis RealEstateFederalIncomeTaxBasis	6700000000	USD
CY2014Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	6998233000	USD
CY2015Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	7387597000	USD
CY2016Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	7376690000	USD
CY2017Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	7667743000	USD
CY2015	us-gaap	Real Estate Improvements RealEstateImprovements	66640000	USD
CY2016	us-gaap	Real Estate Improvements RealEstateImprovements	65892000	USD
CY2017	us-gaap	Real Estate Improvements RealEstateImprovements	71889000	USD
CY2016Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	1890656000	USD
CY2017Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	2118839000	USD
CY2015	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	0	USD
CY2016	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	0	USD
CY2017	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	56985000	USD
CY2015	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	835618000	USD
CY2016Q1	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	217595000	USD
CY2016Q2	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	221478000	USD
CY2016Q3	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	220235000	USD
CY2016Q4	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	217139000	USD
CY2016	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	876447000	USD
CY2017Q1	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	219521000	USD
CY2017Q2	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	223370000	USD
CY2017Q3	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	228178000	USD
CY2017Q4	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	229827000	USD
CY2017	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	900896000	USD
CY2015	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	98895000	USD
CY2016	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	104575000	USD
CY2017	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	110925000	USD
CY2015	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	1222000000	USD
CY2016	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	1549000000	USD
CY2017	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	465000000	USD
CY2015	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	253043000	USD
CY2016	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	3077000	USD
CY2017	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	278999000	USD
CY2017Q1	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	30700000	USD
CY2015Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	5971000	USD
CY2016Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	8462000	USD
CY2017Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	9313000	USD
CY2015	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	233955000	USD
CY2016	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	243403000	USD
CY2017	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	255924000	USD
CY2016Q4	us-gaap	Secured Debt SecuredDebt	897352000	USD
CY2017Q4	us-gaap	Secured Debt SecuredDebt	866000000	USD
CY2017Q4	us-gaap	Secured Debt SecuredDebt	865970000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	17674000	USD
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	20123000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	17547000	USD
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	12818	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	18245	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum	0.009
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum	0.013
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	0	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	0	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	0	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	11280	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	67.96
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	70.63
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	75.37
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	257749	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	270978	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	226514	shares
CY2015	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	74.53
CY2016	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	74.92
CY2017	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	83.41
CY2014Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	818943	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	750246	shares
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	604487	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	499898	shares
CY2014Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	63.39
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	68.09
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	71.03
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	75.80
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	313628	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	398492	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	319823	shares
CY2015	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	61.10
CY2016	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	68.16
CY2017	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	72.26
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum	0.188
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum	0.180
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum	0.189
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum	0.165
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum	0.180
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum	0.189
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum	0.013
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum	0.009
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum	0.013
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum	0.010
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	26752	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	12854	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	14622	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	2100000	USD
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	37.69
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	42.19
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	40.17
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	0.00
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	0.00
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	0.00
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	75.17
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	85.05
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	80.89
CY2014Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	321811	shares
CY2015Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	295205	shares
CY2016Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	105066	shares
CY2017Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	68978	shares
CY2017Q2	us-gaap	Share Price SharePrice	85.51
CY2017Q4	us-gaap	Share Price SharePrice	92.06
CY2017Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	2100000	USD
CY2014Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	38.97
CY2015Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	42.49
CY2016Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	48.27
CY2017Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	61.15
CY2016Q4	us-gaap	Short Term Investments ShortTermInvestments	100000000	USD
CY2017Q4	us-gaap	Short Term Investments ShortTermInvestments	0	USD
CY2015	us-gaap	Stock Issued During Period Shares Conversion Of Units StockIssuedDuringPeriodSharesConversionOfUnits	2	shares
CY2016	us-gaap	Stock Issued During Period Shares Conversion Of Units StockIssuedDuringPeriodSharesConversionOfUnits	8	shares
CY2017	us-gaap	Stock Issued During Period Shares Conversion Of Units StockIssuedDuringPeriodSharesConversionOfUnits	3	shares
CY2015	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	14655	shares
CY2016	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	20797	shares
CY2017	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	18986	shares
CY2015	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	0	shares
CY2016	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	0	shares
CY2017	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	4778	shares
CY2015	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	53358	shares
CY2016	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	202993	shares
CY2017	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	50710	shares
CY2015	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
CY2016	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	-80000	USD
CY2017	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
CY2015	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1111000	USD
CY2016	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1697000	USD
CY2017	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1716000	USD
CY2015	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	22325000	USD
CY2016	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	24996000	USD
CY2017	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	23956000	USD
CY2015	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	176000	USD
CY2016	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	3921000	USD
CY2017	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	931000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	3014873000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	3405363000	USD
CY2014Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2888409000	USD
CY2015Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2892896000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3095553000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3484714000	USD
CY2015	us-gaap	Stockholders Equity Other StockholdersEquityOther	104000	USD
CY2016	us-gaap	Stockholders Equity Other StockholdersEquityOther	10000	USD
CY2017	us-gaap	Stockholders Equity Other StockholdersEquityOther	322000	USD
CY2015Q4	us-gaap	Temporary Equity Carrying Amount Including Portion Attributable To Noncontrolling Interests TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests	79364000	USD
CY2016Q4	us-gaap	Temporary Equity Carrying Amount Including Portion Attributable To Noncontrolling Interests TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests	77037000	USD
CY2017Q4	us-gaap	Temporary Equity Carrying Amount Including Portion Attributable To Noncontrolling Interests TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests	77230000	USD
CY2015	us-gaap	Temporary Equity Issue Period Increase Or Decrease TemporaryEquityIssuePeriodIncreaseOrDecrease	-3788000	USD
CY2016	us-gaap	Temporary Equity Issue Period Increase Or Decrease TemporaryEquityIssuePeriodIncreaseOrDecrease	-9145000	USD
CY2017	us-gaap	Temporary Equity Issue Period Increase Or Decrease TemporaryEquityIssuePeriodIncreaseOrDecrease	-10038000	USD
CY2016Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	10330000	shares
CY2017Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	10073000	shares
CY2016Q4	us-gaap	Treasury Stock Value TreasuryStockValue	373339000	USD
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	364066000	USD
CY2017	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	1700000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2016Q4	us-gaap	Unsecured Debt UnsecuredDebt	1583236000	USD
CY2017Q4	us-gaap	Unsecured Debt UnsecuredDebt	1338628000	USD
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	89490000	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	89903000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	92515000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	89120000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	89580000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	91499000	shares
CY2017	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:left;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 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. In determining if we have a controlling financial interest, we consider factors such as ownership interests, authority to make decisions, kick-out rights and participating rights. At </font><font style="font-family:inherit;font-size:10pt;">December 31, 2017</font><font style="font-family:inherit;font-size:10pt;">, two of our consolidated operating partnerships are VIEs, of which we held between </font><font style="font-family:inherit;font-size:10pt;">92%</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">94%</font><font style="font-family:inherit;font-size:10pt;"> of the outstanding common limited partnership units and the sole </font><font style="font-family:inherit;font-size:10pt;">1%</font><font style="font-family:inherit;font-size:10pt;"> general partnership interest of each consolidated operating partnership. As we are considered the primary beneficiary, we continue to consolidate these operating partnerships. </font></div><div style="line-height:120%;padding-bottom:12px;padding-top:10px;text-align:left;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Acquisitions of Real Estate</font><font style="font-family:inherit;font-size:10pt;">. Upon acquisition of real estate, we determine the fair value of 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 estimating these values, we apply methods similar to those used by independent appraisers of income-producing property. Upon our adoption of Accounting Standard Update 2017-01 ("ASU 2017-01") on January 1, 2017, as discussed below in Recent Accounting Pronouncements, we believe most future transaction costs relating to acquisition of operating assets will be capitalized. Prior to our adoption of ASU 2017-01 transaction costs associated with the acquisition of operating assets were expensed as incurred. Estimates of fair value of acquired debt are based upon interest rates available for the issuance of debt with similar terms and remaining maturities. 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 net carrying value of below market leases is included in other liabilities in our consolidated balance sheets and the net carrying value of in-place leases is included in other assets, net in our consolidated balance sheets. </font></div><div style="line-height:120%;text-align:left;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">During the year ended </font><font style="font-family:inherit;font-size:10pt;">December 31, 2017</font><font style="font-family:inherit;font-size:10pt;">, we recognized amortization expense related to in-place leases of approximately </font><font style="font-family:inherit;font-size:10pt;">$1.3 million</font><font style="font-family:inherit;font-size:10pt;">. During the year ended December 31,2015, we recognized revenues related to below market leases of approximately </font><font style="font-family:inherit;font-size:10pt;">$0.1 million</font><font style="font-family:inherit;font-size:10pt;"> and amortization expense related to in-place leases of approximately </font><font style="font-family:inherit;font-size:10pt;">$0.5 million</font><font style="font-family:inherit;font-size:10pt;">. We did not recognize any revenue or amortization expense related to below market or in-place leases for the year ended December 31, 2016.</font></div><div style="line-height:120%;padding-top:10px;text-align:left;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The weighted average amortization period of in-place leases was approximately </font><font style="font-family:inherit;font-size:10pt;">six</font><font style="font-family:inherit;font-size:10pt;"> months for the year ended </font><font style="font-family:inherit;font-size:10pt;">December 31, 2017</font><font style="font-family:inherit;font-size:10pt;">. The weighted average amortization period of below market leases and in-place leases were approximately </font><font style="font-family:inherit;font-size:10pt;">eight</font><font style="font-family:inherit;font-size:10pt;"> months for the year ended </font><font style="font-family:inherit;font-size:10pt;">December 31, 2015</font><font style="font-family:inherit;font-size:10pt;">.</font></div><div style="line-height:120%;padding-top:10px;text-align:left;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 may exist 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 undiscounted cash flows, trends, strategic decisions regarding future development plans, and other factors in our assessment of whether impairment conditions exist. 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 utilize inputs from a marketplace participant’s perspective. When impairment exists, the long-lived asset is adjusted to its fair value. 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. We did not record any impairment charges for the years ended </font><font style="font-family:inherit;font-size:10pt;">December 31, 2017</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;">2016</font><font style="font-family:inherit;font-size:10pt;">, or </font><font style="font-family:inherit;font-size:10pt;color:#000000;">2015</font><font style="font-family:inherit;font-size:10pt;">. </font></div><div style="line-height:120%;padding-top:10px;text-align:left;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:left;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:left;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-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Short-term Investments</font><font style="font-family:inherit;font-size:10pt;">. Our short-term investments consisted of certificates of deposit which have original maturities of more than three months but less than one year.</font></div><div style="line-height:120%;padding-top:10px;text-align:left;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 prepare the underlying real estate 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. As apartment homes within development properties are completed, the total capitalized development cost of each apartment home is transferred from properties under development including land to buildings and improvements.</font></div><div style="line-height:120%;padding-top:10px;text-align:left;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;">$15.2 million</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;">$18.2 million</font><font style="font-family:inherit;font-size:10pt;">, and </font><font style="font-family:inherit;font-size:10pt;">$19.3 million</font><font style="font-family:inherit;font-size:10pt;"> for the years ended </font><font style="font-family:inherit;font-size:10pt;">December 31, 2017</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;">2016</font><font style="font-family:inherit;font-size:10pt;">, and </font><font style="font-family:inherit;font-size:10pt;">2015</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;">$2.4 million</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;">$4.5 million</font><font style="font-family:inherit;font-size:10pt;">, and </font><font style="font-family:inherit;font-size:10pt;">$3.6 million</font><font style="font-family:inherit;font-size:10pt;"> for the years ended </font><font style="font-family:inherit;font-size:10pt;">December 31, 2017</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;">2016</font><font style="font-family:inherit;font-size:10pt;">, and </font><font style="font-family:inherit;font-size:10pt;">2015</font><font style="font-family:inherit;font-size:10pt;">, respectively.</font></div><div style="line-height:120%;padding-top:10px;text-align:left;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:left;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We also incur expenditures related to renovation and construction of office space we lease and we capitalize these leasehold improvements as furniture, fixtures, equipment and other. We depreciate these costs using the straight-line method over the shorter of the lease term or the useful life of the improvement. </font></div><div style="line-height:120%;padding-top:10px;text-align:left;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%;padding-top:10px;text-align:left;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 style="width:80%;" rowspan="1" colspan="1"></td><td style="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:center;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:center;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/liabilities (in-place leases 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:center;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-bottom:6px;padding-top:6px;text-align:left;text-indent:30px;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;"> Derivative financial instruments are recorded in the consolidated balance sheets at fair value and we do not apply master netting for financial reporting purposes. Accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether we have elected to designate a derivative in a hedging relationship and apply hedge accounting, and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows or other types of forecasted transactions are cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes attributable to the earnings effect of the hedged transactions. We may enter into derivative contracts which are intended to economically hedge certain of our risks, for which hedge accounting does not apply or we elect not to apply hedge accounting.</font></div><div style="line-height:120%;padding-top:10px;text-align:left;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 the disposal represents a strategic shift, such as disposal of a major line of business, a major geographical area or a major equity investment. The results of operations for properties sold during the period or classified as held for sale at the end of the period, and meeting the above criteria of discontinued operations, are classified as discontinued operations for all periods presented. 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 meeting the criteria of discontinued operations 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. Consolidated operating properties sold or classified as held for sale, which do not meet the above criteria of discontinued operations are not included in discontinued operations and the related gains and losses are included in continuing operations. Properties sold by our unconsolidated entities which do not meet the above criteria of discontinued operations are not included in discontinued operations and related gains or losses are reported as a component of equity in income of joint ventures.</font></div><div style="line-height:120%;padding-top:10px;text-align:left;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:left;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> See Note 7, "Acquisitions, Dispositions, and Discontinued Operations," for discussion of discontinued operations for the year ended </font><font style="font-family:inherit;font-size:10pt;">December 31, 2016</font><font style="font-family:inherit;font-size:10pt;">. There were no discontinued operations for the years ended 2017 or 2015.</font></div><div style="line-height:120%;padding-top:10px;text-align:left;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 or non-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:left;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%;text-align:left;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:left;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:left;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:left;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:left;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Recurring Fair Value Measurements.</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-bottom:6px;padding-top:6px;text-align:left;text-indent:30px;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. The inputs associated with the valuation of our recurring deferred compensation plan investments are included in Level 1 of the fair value hierarchy. </font></div><div style="line-height:120%;padding-bottom:6px;padding-top:6px;text-align:left;text-indent:30px;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-bottom:6px;padding-top:6px;text-align:left;text-indent:30px;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:left;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Non-recurring Fair Value Measurements.</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 if they are impaired using the fair value methodologies used to measure long-lived assets described above at "Asset Impairment." Non-recurring fair value disclosures are not provided for impairments on assets disposed during the period because they are no longer owned by us. The inputs associated with the valuation of long-lived assets are generally included in Level 3 of the fair value hierarchy, unless a quoted price for a similar long-lived asset in an active market exists, at which time they are included in Level 2 of the fair value hierarchy.</font></div><div style="line-height:120%;padding-top:10px;text-align:left;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;"> As of </font><font style="font-family:inherit;font-size:10pt;">December 31, 2017</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">2016</font><font style="font-family:inherit;font-size:10pt;">, the carrying values of cash and cash equivalents, short-term investments, accounts receivable, accounts payable, accrued expenses and distributions payable represent fair value because of the short-term nature of these instruments. The carrying value of restricted cash approximates its fair value based on the nature of our assessment of the ability to recover these amounts. The carrying value of our notes receivable, which are included in other assets, net in our consolidated balance sheets, approximates their fair value. The estimated fair values are based on certain factors, such as market interest rates, terms of the note and credit worthiness of the borrower. These financial instruments utilize Level 3 inputs. In calculating the fair value of our notes payable, interest rate and spread assumptions reflect 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:left;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 </font><font style="font-family:inherit;font-size:10pt;">eighteen</font><font style="font-family:inherit;font-size:10pt;"> months, with monthly payments due in advance. All other sources of income, including interest and fee and asset management income, are recognized as earned. 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-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Reclassifications. </font><font style="font-family:inherit;font-size:10pt;">Certain reclassifications have been made to amounts in prior period financial statements to conform to the current period presentation. We reclassified certain insignificant amounts in the consolidated statements of cash flows for the years ended </font><font style="font-family:inherit;font-size:10pt;">December 31, 2016</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">2015</font><font style="font-family:inherit;font-size:10pt;">. These reclassifications had no impact on our consolidated cash flows from operating, investing or financing activities. </font></div><div style="line-height:120%;padding-top:10px;text-indent:30px;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, 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:left;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, notes receivable, prepaid expenses, the value of in-place leases net of related accumulated amortization, and other miscellaneous receivables. Investments under deferred compensation plans are classified as trading securities and are adjusted to fair market value at period end. For a further discussion of our investments under deferred compensation plans, see Note 11, “Share-based Compensation and Benefit Plans.” Deferred financing costs are related to our unsecured credit facility and unsecured short-term borrowing facility, and are amortized no longer than the terms of the related facilities 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 generally range from three to ten years.</font></div><div style="line-height:120%;padding-top:10px;text-align:left;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our notes receivable relate to real estate secured loans to unaffiliated third parties. At </font><font style="font-family:inherit;font-size:10pt;">December 31, 2017</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">2016</font><font style="font-family:inherit;font-size:10pt;">, we had one outstanding note receivable balance of approximately </font><font style="font-family:inherit;font-size:10pt;">$18.8 million</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">$17.2 million</font><font style="font-family:inherit;font-size:10pt;">, respectively. The weighted average interest rates were approximately </font><font style="font-family:inherit;font-size:10pt;">4.0%</font><font style="font-family:inherit;font-size:10pt;"> for each of the years ended </font><font style="font-family:inherit;font-size:10pt;">December 31, 2017</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">2016</font><font style="font-family:inherit;font-size:10pt;"> related to such note. At </font><font style="font-family:inherit;font-size:10pt;">December 31, 2017</font><font style="font-family:inherit;font-size:10pt;">, construction was complete on this project and we were not committed to fund any additional amounts under the note. Interest is recognized over the life of the note and is included in interest and other income in our consolidated statements of income and comprehensive income. We consider a note receivable to be impaired if it is probable we will not collect all contractually due principal and interest. We do not accrue interest when a note is considered impaired and an allowance is recorded for any principal and previously accrued interest which is not believed to be collectible. All cash receipts on impaired notes are applied to reduce the principal amount of such notes until the principal has been recovered and, thereafter, are recognized as interest income. There were no impairments as of </font><font style="font-family:inherit;font-size:10pt;">December 31, 2017</font><font style="font-family:inherit;font-size:10pt;"> or </font><font style="font-family:inherit;font-size:10pt;">2016</font><font style="font-family:inherit;font-size:10pt;">.</font></div><div style="line-height:120%;padding-top:10px;text-align:left;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;">. We operate in a single reportable segment which includes the ownership, management, development, redevelopment, acquisition, and construction of multifamily apartment communities. Each of our operating properties is considered a separate operating segment as each property earns revenues and incurs expenses, individual operating results are reviewed and discrete financial information is available. We do not distinguish or group our consolidated operations based on geography, size or type. Our multifamily apartment communities have similar long-term economic characteristics and provide similar products and services to our residents. Further, all material operations are within the United States and no multifamily apartment community comprises more than 10% of consolidated revenues. As a result, our operating properties are aggregated into a single 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;">99%</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 each of the years ended </font><font style="font-family:inherit;font-size:10pt;">December 31, 2017</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;">2016</font><font style="font-family:inherit;font-size:10pt;">, and </font><font style="font-family:inherit;font-size:10pt;">2015</font><font style="font-family:inherit;font-size:10pt;">.</font></div><div style="line-height:120%;padding-top:10px;text-align:left;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:left;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:left;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. 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 style="line-height:120%;padding-top:10px;text-align:left;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Recent Accounting Pronouncements. </font><font style="font-family:inherit;font-size:10pt;">In January 2017, the Financial Accounting Standards Board ("FASB") issued ASU 2017-01, "Clarifying the Definition of a Business (Topic 805)." ASU 2017-01 clarifies the definition of a business and provides further guidance for evaluating whether a transaction will be accounted for as an acquisition of an asset or a business. ASU 2017-01 is effective for interim and annual periods beginning after December 15, 2017, early adoption was permitted, and we adopted ASU 2017-01 as of January 1, 2017. We believe most of our future acquisitions of operating properties will qualify as asset acquisitions and most future transaction costs associated with these acquisitions will be capitalized.</font></div><div style="line-height:120%;padding-top:10px;text-align:left;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In February 2017, the FASB issued ASU 2017-05, "Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets." ASU 2017-05 clarifies the definition of an in-substance nonfinancial asset and changes the accounting for partial sales of nonfinancial assets to be more consistent with the accounting for a sale of a business pursuant to ASU 2017-01. This update is effective for interim and annual periods beginning after December 15, 2017 using a full retrospective or modified retrospective method and is required to be adopted in conjunction with ASU 2014-09, "Revenue from Contracts with Customers" discussed below. We adopted ASU 2017-05 as of January 1, 2018, along with our adoption of ASU 2014-09, using the modified retrospective method and it did not have a material impact on our consolidated financial statements. We believe most of our future contributions of nonfinancial assets to our joint ventures, if any, will result in the recognition of a full gain or loss as if we sold 100% of the nonfinancial asset and we will also measure our retained interest at fair value. </font></div><div style="line-height:120%;padding-bottom:6px;padding-top:6px;text-align:left;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In May 2014, the FASB issued ASU 2014-09 which prescribes a single, common revenue standard to replace most existing revenue recognition guidance in GAAP, including most industry-specific requirements. The standard outlines a five-step model whereby revenue is recognized as performance obligations within a contract are satisfied. Several ASUs have been issued since the issuance of ASU 2014-09 which modify certain sections of the new revenue recognition standard, and are intended to promote a more consistent interpretation and application of the principles outlined in the standard. We adopted ASU 2014-09, and all related amendments, effective January 1, 2018 using the modified retrospective with cumulative-effect transition method which requires us to recognize the cumulative effect of initially applying the new revenue standard as an adjustment, if any, to the opening balance of retained earnings. We have identified our revenue streams and finalized our evaluation of the impact on our consolidated financial statements and internal accounting processes. Upon adoption, we will present certain revenue streams, which are currently included as a component of our other property revenues, as rental revenues due to the nature and timing of revenue recognition for these revenue streams. The new presentation will be applied prospectively upon adoption as this adjustment will not have an impact upon total property revenues or the opening balance of retained earnings and the adoption of ASU 2014-09 and its related amendments will not have a material impact on our consolidated financial statements as the majority of our revenue is derived from real estate lease contracts. Had ASU 2014-09 been effective as of January 1, 2017, we would have reclassified approximately </font><font style="font-family:inherit;font-size:10pt;">$21.9 million</font><font style="font-family:inherit;font-size:10pt;"> from other property revenue to rental revenue for the year end December 31, 2017.</font></div><div style="line-height:120%;padding-bottom:6px;padding-top:6px;text-align:left;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In February 2016, the FASB issued ASU 2016-02, "Leases." ASU 2016-02 supersedes the current accounting for leases and while retaining two distinct types of leases, finance and operating, (i) requires lessees to record a right of use asset and a related liability for the rights and obligations associated with a lease, regardless of lease classification, and recognize lease expense in a manner similar to current accounting (ii) eliminates most real estate specific lease provisions, and (iii) aligns many of the underlying lessor model principles with those in the new revenue standard. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and early adoption is permitted. We are required to adopt ASU 2016-02 using the modified retrospective approach which requires us to record leases existing as of or are entered into after the beginning of the earliest comparative period presented in the financial statements under the new lease standard. We anticipate adopting ASU 2016-02 as of January 1, 2019. Based on our assessments, most of our operating lease commitments will be subject to the new guidance and recognized as operating lease liabilities and right-of-use assets upon adoption and believe our adoption of the new leasing standard will have an immaterial increase in the assets and liabilities on our consolidated balance sheets, with no material impact to our consolidated statements of income and comprehensive income. However, the ultimate impact will depend on our lease portfolio as of the adoption date. </font></div><div style="line-height:120%;padding-bottom:6px;padding-top:6px;text-align:left;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In March 2016, the FASB issued ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting." ASU 2016-09 amends several aspects of the accounting for share-based payment transactions, including the income tax consequences, accrual of compensation cost, classification of awards as either equity or liabilities, and classification on the statement of cash flows. ASU 2016-09 is effective for interim and annual periods beginning after December 15, 2016, and we adopted ASU 2016-09 as of January 1, 2017. Upon adoption we elected to recognize forfeitures of share-based payment awards as they occur, rather than estimating forfeitures at the time awards are granted. Historically, our estimated forfeitures approximated actual forfeitures and the impact of the change in policy upon our adoption of ASU 2016-09 did not have a material impact on our consolidated financial statements. </font></div><div style="line-height:120%;padding-bottom:6px;padding-top:6px;text-align:left;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In August 2016, the FASB issued ASU 2016-15, "Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force)." ASU 2016-15 clarifies how eight specific cash receipts and cash payments are to be presented and classified on the statement of cash flows, including debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments, contingent consideration made after a business combination, distributions received from equity method investees, beneficial interests in securitization transactions, and separately identifiable cash flows and application of predominance principle. ASU 2016-15 is effective for interim and annual periods beginning after December 15, 2017, and early adoption is permitted. Each amendment in this standard must be applied retrospectively. We adopted ASU 2016-15 as of January 1, 2018 using the retrospective method by applying the cumulative earnings approach to classify distributions received from our equity method investees and it did not have a material effect on our consolidated statements of cash flows upon adoption. </font></div><div style="line-height:120%;padding-bottom:10px;padding-top:6px;text-align:left;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In August 2017, the FASB issued ASU 2017-12, "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities." ASU 2017-12 amends the hedge accounting model to provide better insight to risk management activities in the financial statements, reduces the complexity in cash flow hedges of interest rate risk, eliminates the requirement to separately measure and report hedge ineffectiveness, requires the entire change in the fair value of a hedging instrument included in the assessment of the hedge effectiveness to be recorded in other comprehensive income, with amounts reclassified to earnings to be presented in the same line item used to present the earnings effect of the hedged item when the hedged item affects earnings and allows the initial prospective quantitative assessment of hedge effectiveness to be performed at any time after hedge designation, but no later than the first quarterly effectiveness testing date. ASU 2017-12 is effective for interim and annual periods beginning after December 15, 2018, and early adoption is permitted. The amendments in this standard must be applied using the modified retrospective approach for cash flow and net investment hedge relationships existing on the date of adoption. We adopted ASU 2017-12 in the third quarter of 2017, and this adoption had no impact upon adoption as we had no hedging activities in the prior periods presented.</font></div></div>
CY2017	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:left;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, redevelopment, 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, 2017</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;">162</font><font style="font-family:inherit;font-size:10pt;"> multifamily properties comprised of </font><font style="font-family:inherit;font-size:10pt;">55,143</font><font style="font-family:inherit;font-size:10pt;"> apartment homes across the United States. Of the </font><font style="font-family:inherit;font-size:10pt;">162</font><font style="font-family:inherit;font-size:10pt;"> properties, </font><font style="font-family:inherit;font-size:10pt;">seven</font><font style="font-family:inherit;font-size:10pt;"> properties were under construction, and will consist of a total of </font><font style="font-family:inherit;font-size:10pt;">2,110</font><font style="font-family:inherit;font-size:10pt;"> apartment homes when completed. We also own land holdings which we may develop into multifamily communities in the future.</font></div></div>
CY2017	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:10px;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Reclassifications. </font><font style="font-family:inherit;font-size:10pt;">Certain reclassifications have been made to amounts in prior period financial statements to conform to the current period presentation. We reclassified certain insignificant amounts in the consolidated statements of cash flows for the years ended </font><font style="font-family:inherit;font-size:10pt;">December 31, 2016</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">2015</font><font style="font-family:inherit;font-size:10pt;">. These reclassifications had no impact on our consolidated cash flows from operating, investing or financing activities. </font></div></div>
CY2017	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:left;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. 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>

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2017 Q4 Form 10-K Financial Statement

#000090634518000007 Filed on February 16, 2018

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$CPT CAMDEN PROPERTY TRUST Stock $cpt

2017 Q4 Form 10-K Financial Statement

#000090634518000007 Filed on February 16, 2018

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CAMDEN PROPERTY TRUST Stock $cpt