$ARE
ALEXANDRIA REAL ESTATE EQUITIES, INC. Stock $are

$are Overview Financials Valuation SEC Filings Company Website

2012 Form 10-K Financial Statement

#000110465913014040 Filed on February 26, 2013

Income Statement

Concept	2012	2011 Q4	2011 Q3
Revenue	$574.5M	$139.2M	$138.1M
YoY Change	7.03%	27.63%	12.51%
Cost Of Revenue	$172.8M	$41.60M	$40.90M
YoY Change	9.64%	43.45%	18.9%
Gross Profit	$401.7M	$97.70M	$97.20M
YoY Change	5.96%	22.13%	9.95%
Gross Profit Margin	69.92%	70.16%	70.41%
Selling, General & Admin	$47.70M	$10.60M	$10.30M
YoY Change	16.06%	23.26%	28.75%
% of Gross Profit	11.87%	10.85%	10.6%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$185.7M	$40.90M	$40.00M
YoY Change	17.52%	18.55%	25.0%
% of Gross Profit	46.23%	41.86%	41.15%
Operating Expenses	$233.4M	$50.30M	$49.00M
YoY Change	21.56%	-355.33%	22.19%
Operating Profit	$168.3M	$47.40M	$48.20M
YoY Change	-10.05%	-52.46%	-0.21%
Interest Expense	$69.18M	-$14.80M	$14.27M
YoY Change	9.17%	492.0%	-188.65%
% of Operating Profit	41.11%	-31.22%	29.61%
Other Income/Expense, Net
YoY Change
Pretax Income	$94.80M	$32.60M	$31.10M
YoY Change	-19.18%	-78.87%	0.65%
Income Tax	$0.00	$0.00	$0.00
% Of Pretax Income	0.0%	0.0%	0.0%
Net Earnings	$93.31M	$34.30M	$30.22M
YoY Change	-17.67%	-79.07%	2.45%
Net Earnings / Revenue	16.24%	24.63%	21.89%
Basic Earnings Per Share	$1.09		$0.40
Diluted Earnings Per Share	$1.09	$558.6K	$0.40
COMMON SHARES
Basic Shares Outstanding	62.16M shares		61.30M shares
Diluted Shares Outstanding	62.16M shares		61.30M shares

Balance Sheet

Concept	2012	2011 Q4	2011 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$141.0M	$79.00M	$73.00M
YoY Change	78.48%	-13.19%	-34.23%
Cash & Equivalents	$141.0M	$78.54M	$73.06M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables	$8.000M	$7.000M	$7.000M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$149.0M	$86.00M	$80.00M
YoY Change	73.26%	-10.42%	-31.03%
LONG-TERM ASSETS
Property, Plant & Equipment	$6.425B	$6.008B	$5.885B
YoY Change	6.94%	10.34%	12.35%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$115.0M	$32.00K	$129.0M
YoY Change	19.79%	-99.96%	10.26%
Other Assets	$370.0M	$301.0M	$161.0M
YoY Change	22.92%	28.63%	11.81%
Total Long-Term Assets	$7.001B	$6.488B	$6.376B
YoY Change	7.91%	11.67%	13.19%
TOTAL ASSETS
Total Short-Term Assets	$149.0M	$86.00M	$80.00M
Total Long-Term Assets	$7.001B	$6.488B	$6.376B
Total Assets	$7.150B	$6.574B	$6.456B
YoY Change	8.76%	11.31%	12.3%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$106.0M	$86.00M	$330.0M
YoY Change	23.26%	-71.71%	11.86%
Accrued Expenses	$83.00M	$37.00M
YoY Change	124.32%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$230.0M	$160.0M	$365.0M
YoY Change	43.75%	-52.24%	13.71%
LONG-TERM LIABILITIES
Long-Term Debt	$3.182B	$2.779B	$2.659B
YoY Change	14.5%	7.55%	5.56%
Other Long-Term Liabilities	$235.0M	$202.0M
YoY Change	16.34%
Total Long-Term Liabilities	$3.417B	$2.981B	$2.659B
YoY Change	14.63%	15.36%	5.56%
TOTAL LIABILITIES
Total Short-Term Liabilities	$230.0M	$160.0M	$365.0M
Total Long-Term Liabilities	$3.417B	$2.981B	$2.659B
Total Liabilities	$3.708B	$3.141B	$3.082B
YoY Change	15.88%	5.52%	6.39%
SHAREHOLDERS EQUITY
Retained Earnings
YoY Change
Common Stock		$616.0K
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$3.442B	$3.374B	$3.373B
YoY Change
Total Liabilities & Shareholders Equity	$7.150B	$6.574B	$6.456B
YoY Change	8.76%	11.31%	12.3%

Cashflow Statement

Concept	2012	2011 Q4	2011 Q3
OPERATING ACTIVITIES
Net Income	$93.31M	$34.30M	$30.22M
YoY Change	-17.67%	-79.07%	2.45%
Depreciation, Depletion And Amortization	$185.7M	$40.90M	$40.00M
YoY Change	17.52%	18.55%	25.0%
Cash From Operating Activities	$305.5M	$67.00M	$69.80M
YoY Change	23.72%	3.88%	91.23%
INVESTING ACTIVITIES
Capital Expenditures	-$591.2M	-$133.6M	-$131.9M
YoY Change	-19.58%	-63.73%	-4.49%
Acquisitions
YoY Change
Other Investing Activities	$33.10M	-$4.500M	$12.20M
YoY Change	2106.67%	-101.69%	-971.43%
Cash From Investing Activities	-$558.1M	-$138.1M	-$119.7M
YoY Change	-23.92%	35.26%	-14.26%
FINANCING ACTIVITIES
Cash Dividend Paid	$154.3M
YoY Change	14.13%
Common Stock Issuance & Retirement, Net	$97.89M
YoY Change	-78.32%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$314.9M	81.90M	61.90M
YoY Change	-34.29%	365.34%	-55.97%
NET CHANGE
Cash From Operating Activities	$305.5M	67.00M	69.80M
Cash From Investing Activities	-$558.1M	-138.1M	-119.7M
Cash From Financing Activities	$314.9M	81.90M	61.90M
Net Change In Cash	$62.29M	10.80M	12.00M
YoY Change	-934.69%	-154.0%	-68.0%
FREE CASH FLOW
Cash From Operating Activities	$305.5M	$67.00M	$69.80M
Capital Expenditures	-$591.2M	-$133.6M	-$131.9M
Free Cash Flow	$896.7M	$200.6M	$201.7M
YoY Change	-8.69%	-53.65%	15.52%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6574129000	USD
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	63244645	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	61560472	shares
CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	63244645	shares
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	61560472	shares
CY2012	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	586073000	USD
CY2012	us-gaap	Costs And Expenses CostsAndExpenses	484627000	USD
CY2012	are	Net Income Loss Attributable To Common Stockholders NetIncomeLossAttributableToCommonStockholders	67630000	USD
CY2011	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	414164000	USD
CY2011	us-gaap	Tenant Reimbursements TenantReimbursements	128299000	USD
CY2011	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	5762000	USD
CY2011	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	548225000	USD
CY2010	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	350079000	USD
CY2010	us-gaap	Tenant Reimbursements TenantReimbursements	105423000	USD
CY2010	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	5119000	USD
CY2010	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	460621000	USD
CY2011	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	159567000	USD
CY2011	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	41127000	USD
CY2011	us-gaap	Interest Expense InterestExpense	63378000	USD
CY2011	us-gaap	Depreciation And Amortization DepreciationAndAmortization	153087000	USD
CY2011	us-gaap	Costs And Expenses CostsAndExpenses	423644000	USD
CY2010	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	123309000	USD
CY2010	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	34345000	USD
CY2010	us-gaap	Interest Expense InterestExpense	69509000	USD
CY2010	us-gaap	Depreciation And Amortization DepreciationAndAmortization	121207000	USD
CY2010	us-gaap	Costs And Expenses CostsAndExpenses	393538000	USD
CY2011	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-6485000	USD
CY2010	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-45168000	USD
CY2011	us-gaap	Gain Loss On Sale Of Properties Net Of Applicable Income Taxes GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes	46000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	135393000	USD
CY2010	us-gaap	Gain Loss On Sale Of Properties Net Of Applicable Income Taxes GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes	59442000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	139022000	USD
CY2011	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3975000	USD
CY2011	us-gaap	Dividends Preferred Stock DividendsPreferredStock	28357000	USD
CY2011	us-gaap	Participating Securities Distributed And Undistributed Earnings ParticipatingSecuritiesDistributedAndUndistributedEarnings	1088000	USD
CY2011	are	Net Income Loss Attributable To Common Stockholders NetIncomeLossAttributableToCommonStockholders	101973000	USD
CY2010	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3729000	USD
CY2010	us-gaap	Dividends Preferred Stock DividendsPreferredStock	28357000	USD
CY2010	us-gaap	Participating Securities Distributed And Undistributed Earnings ParticipatingSecuritiesDistributedAndUndistributedEarnings	995000	USD
CY2010	are	Net Income Loss Attributable To Common Stockholders NetIncomeLossAttributableToCommonStockholders	105941000	USD
CY2011	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	1.73
CY2010	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	2.19
CY2012	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-2225000	USD
CY2012	us-gaap	Gain Loss On Sale Of Properties Net Of Applicable Income Taxes GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes	1864000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-2361000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	12319000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	9640000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	115168000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	111804000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	238000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-2561000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-2323000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	292000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-1415000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-1123000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-25313000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	30629000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	5316000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	15499000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	154521000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	3833000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	150688000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	305533000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-558100000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	314860000	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	62432000	USD
CY2011	are	Amortization Of Above Below Market Leases AmortizationOfAboveBelowMarketLeases	9332000	USD
CY2011	us-gaap	Straight Line Rent StraightLineRent	26797000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	11755000	USD
CY2011	us-gaap	Gain On Sale Of Investments GainOnSaleOfInvestments	4846000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-9630000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	21457000	USD
CY2010	us-gaap	Interest Paid Net InterestPaidNet	57198000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	11827000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-16101000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	119292000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	4050000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Per Basic And Diluted Share IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	1.55
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	115242000	USD
CY2011	are	Depreciation And Amortization Cash Flow Impact DepreciationAndAmortizationCashFlowImpact	158026000	USD
CY2010	are	Depreciation And Amortization Cash Flow Impact DepreciationAndAmortizationCashFlowImpact	126640000	USD
CY2010	us-gaap	Gain Loss On Disposition Of Real Estate Discontinued Operations GainLossOnDispositionOfRealEstateDiscontinuedOperations	24000	USD
CY2012	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	847147000	USD
CY2011	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	9300000	USD
CY2011	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	3819000	USD
CY2011	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	1795000	USD
CY2010	are	Amortization Of Above Below Market Leases AmortizationOfAboveBelowMarketLeases	7868000	USD
CY2010	us-gaap	Straight Line Rent StraightLineRent	22832000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	10816000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	48000	USD
CY2010	us-gaap	Gain On Sale Of Investments GainOnSaleOfInvestments	2302000	USD
CY2010	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	303000	USD
CY2011	us-gaap	Increase Decrease In Restricted Cash For Operating Activities IncreaseDecreaseInRestrictedCashForOperatingActivities	465000	USD
CY2010	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	7892000	USD
CY2010	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	9999000	USD
CY2011	us-gaap	Increase Decrease In Leasing Receivables IncreaseDecreaseInLeasingReceivables	2359000	USD
CY2011	us-gaap	Increase Decrease In Deferred Leasing Fees IncreaseDecreaseInDeferredLeasingFees	56226000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	22359000	USD
CY2011	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	41823000	USD
CY2010	us-gaap	Increase Decrease In Restricted Cash For Operating Activities IncreaseDecreaseInRestrictedCashForOperatingActivities	-1679000	USD
CY2010	us-gaap	Increase Decrease In Leasing Receivables IncreaseDecreaseInLeasingReceivables	1301000	USD
CY2010	us-gaap	Increase Decrease In Deferred Leasing Fees IncreaseDecreaseInDeferredLeasingFees	27577000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1839000	USD
CY2010	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	8720000	USD
CY2011	us-gaap	Proceeds From Sale Of Property Held For Sale ProceedsFromSaleOfPropertyHeldForSale	20078000	USD
CY2010	us-gaap	Proceeds From Sale Of Property Held For Sale ProceedsFromSaleOfPropertyHeldForSale	275979000	USD
CY2010	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	423930000	USD
CY2011	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	430038000	USD
CY2011	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	305030000	USD
CY2010	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	301709000	USD
CY2011	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	2183000	USD
CY2011	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	5256000	USD
CY2010	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-18178000	USD
CY2010	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	3016000	USD
CY2011	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	27999000	USD
CY2010	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	14807000	USD
CY2011	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	16849000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-733579000	USD
CY2010	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	4714000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-444745000	USD
CY2012	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	22250000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	451539000	USD
CY2010	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	342342000	USD
CY2012	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	544650000	USD
CY2011	us-gaap	Repayments Of Convertible Debt RepaymentsOfConvertibleDebt	221439000	USD
CY2010	us-gaap	Repayments Of Convertible Debt RepaymentsOfConvertibleDebt	97309000	USD
CY2011	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	1784000000	USD
CY2010	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	582000000	USD
CY2011	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	2117000	USD
CY2010	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	2877000	USD
CY2011	us-gaap	Proceeds From Repayments Of Restricted Cash Financing Activities ProceedsFromRepaymentsOfRestrictedCashFinancingActivities	7311000	USD
CY2010	us-gaap	Proceeds From Repayments Of Restricted Cash Financing Activities ProceedsFromRepaymentsOfRestrictedCashFinancingActivities	-1853000	USD
CY2011	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	27316000	USD
CY2010	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	5273000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	106889000	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	67874000	USD
CY2011	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	28357000	USD
CY2010	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	28357000	USD
CY2011	us-gaap	Payments Of Distributions To Affiliates PaymentsOfDistributionsToAffiliates	1263000	USD
CY2010	us-gaap	Payments Of Distributions To Affiliates PaymentsOfDistributionsToAffiliates	1331000	USD
CY2010	us-gaap	Payments For Repurchase Of Redeemable Noncontrolling Interest PaymentsForRepurchaseOfRedeemableNoncontrollingInterest	2346000	USD
CY2011	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	1000000	USD
CY2010	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	723000	USD
CY2011	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	2707000	USD
CY2010	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	2895000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	479156000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	237912000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-12693000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	20604000	USD
CY2012	are	Repayments Of Unsecured Bank Term Loans RepaymentsOfUnsecuredBankTermLoans	250000000	USD
CY2012	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	129638000	USD
CY2012	us-gaap	Proceeds From Issuance Of Redeemable Preferred Stock ProceedsFromIssuanceOfRedeemablePreferredStock	124868000	USD
CY2012	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	17810000	USD
CY2012	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	26367000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	140971000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	91232000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	70628000	USD
CY2011	us-gaap	Interest Paid Net InterestPaidNet	52324000	USD
CY2012	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	131790000	USD
CY2012	us-gaap	Stock Redeemed Or Called During Period Value StockRedeemedOrCalledDuringPeriodValue	129638000	USD
CY2012	are	Note Receivable From Sale Of Real Estate NoteReceivableFromSaleOfRealEstate	-6125000	USD
CY2009Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2364638000	USD
CY2010	are	Contributions By Noncontrolling Interests ContributionsByNoncontrollingInterests	723000	USD
CY2010	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	2895000	USD
CY2010	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	179000	USD
CY2010	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	196156000	USD
CY2010	are	Common Stock Issued During Period Value CommonStockIssuedDuringPeriodValue	342342000	USD
CY2010	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	22069000	USD
CY2010	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	28357000	USD
CY2010	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	77302000	USD
CY2010Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2970408000	USD
CY2011	are	Contributions By Noncontrolling Interests ContributionsByNoncontrollingInterests	1000000	USD
CY2011	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	2707000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Equity Component Of Convertible Debt AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	-2981000	USD
CY2011	are	Common Stock Issued During Period Value CommonStockIssuedDuringPeriodValue	451539000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	22386000	USD
CY2011	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	28357000	USD
CY2011	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	112353000	USD
CY2012	are	Contributions By Noncontrolling Interests ContributionsByNoncontrollingInterests	1875000	USD
CY2012	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	913000	USD
CY2012	are	Common Stock Issued During Period Value CommonStockIssuedDuringPeriodValue	97890000	USD
CY2012	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	124868000	USD
CY2012	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	22082000	USD
CY2012	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	27678000	USD
CY2012	us-gaap	Nature Of Operations NatureOfOperations	<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"> <p style="MARGIN: 0in 0in 0pt"><b><font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">1.  Background</font></b></p> <p style="MARGIN: 0in 0in 0pt"> </p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">As used in this annual report on Form 10-K, references to the “Company,” “Alexandria,” “we,” “our,” and “us” refer to Alexandria Real Estate Equities, Inc. and its subsidiaries.</font></p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"> </p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Alexandria Real Estate Equities, Inc. (NYSE: ARE), a self-administered and self-managed real estate investment trust (“REIT”), is the largest and leading investment-grade REIT focused principally on owning, operating, developing, redeveloping, and acquiring high-quality, sustainable real estate for the broad and diverse life science industry.  Alexandria’s client tenants span the life science industry, including renowned academic and medical institutions, multinational pharmaceutical companies, public and private biotechnology entities, United States (“U.S.”) government research agencies, medical device companies, industrial biotech companies, venture capital firms, and life science product and service companies.  For additional information on Alexandria Real Estate Equities, Inc., please visit www.are.com.</font></p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"> </p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Our asset base contains 178 properties approximating 17.1 million rentable square feet consisting of the following, as of December 31, 2012:</font></p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"> </p> <table style="WIDTH: 702px; BORDER-COLLAPSE: collapse; HEIGHT: 95px" cellspacing="0" cellpadding="0" width="702" border="0"> <tr style="HEIGHT: 0px"> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 66.16%; PADDING-TOP: 0in" valign="bottom" width="66%"> <p style="MARGIN: 0in 0in 0pt 10pt; TEXT-INDENT: -10pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 4.16%; PADDING-TOP: 0in" valign="bottom" width="4%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 28%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="28%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Rentable Square Feet</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.68%; PADDING-TOP: 0in" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"> </p></td></tr> <tr style="HEIGHT: 0px"> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 66.16%; PADDING-TOP: 0in" valign="top" width="66%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt 10pt; TEXT-INDENT: -10pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Operating properties</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 4.16%; PADDING-TOP: 0in" valign="bottom" width="4%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 28%; PADDING-TOP: 0in; BORDER-BOTTOM: medium none" valign="bottom" width="28%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">14,953,968</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 1.68%; PADDING-TOP: 0in" valign="bottom" width="1%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td></tr> <tr style="HEIGHT: 0px"> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 66.16%; PADDING-TOP: 0in" valign="top" width="66%"> <p style="MARGIN: 0in 0in 0pt 10pt; TEXT-INDENT: -10pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Development properties</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 4.16%; PADDING-TOP: 0in" valign="bottom" width="4%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 28%; PADDING-TOP: 0in" valign="bottom" width="28%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">1,566,774</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.68%; PADDING-TOP: 0in" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"> </p></td></tr> <tr style="HEIGHT: 0px"> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 66.16%; PADDING-TOP: 0in" valign="top" width="66%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt 10pt; TEXT-INDENT: -10pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Redevelopment properties</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 4.16%; PADDING-TOP: 0in" valign="bottom" width="4%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 28%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="28%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">547,092</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 1.68%; PADDING-TOP: 0in" valign="bottom" width="1%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td></tr> <tr style="HEIGHT: 0px"> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 66.16%; PADDING-TOP: 0in" valign="top" width="66%"> <p style="MARGIN: 0in 0in 0pt 10pt; TEXT-INDENT: -10pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Total</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 4.16%; PADDING-TOP: 0in" valign="bottom" width="4%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 28%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 2.25pt double" valign="bottom" width="28%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">17,067,834</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.68%; PADDING-TOP: 0in" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"> </p></td></tr></table> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"> </p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">As of December 31, 2012, we had 494 leases with a total of 396 client tenants, and 74, or 42%, of our 178 properties were single-tenant properties.  Leases in our multi-tenant buildings typically have terms of three to seven years, while the single-tenant building leases typically have initial terms of 10 to 20 years.  As of December 31, 2012:</font></p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"> </p> <p style="MARGIN: 0in 0in 0pt 0.75in; TEXT-INDENT: -0.25in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Symbol" size="2">·</font><font style="FONT-SIZE: 3pt" size="1">                 </font> <font style="FONT-SIZE: 10pt" size="2">Approximately 94% of our leases (on a rentable square footage basis) were triple net leases, requiring client tenants to pay substantially all real estate taxes, insurance, utilities, common area, and other operating expenses (including increases thereto) in addition to base rent;</font></p> <p style="MARGIN: 0in 0in 0pt 0.75in; TEXT-INDENT: -0.25in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Symbol" size="2">·</font><font style="FONT-SIZE: 3pt" size="1">                 </font> <font style="FONT-SIZE: 10pt" size="2">Approximately 96% of our leases (on a rentable square footage basis) contained effective annual rent escalations that were either fixed (generally ranging from 3% to 3.5%) or indexed based on a consumer price index or other index;</font></p> <p style="MARGIN: 0in 0in 0pt 0.75in; TEXT-INDENT: -0.25in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Symbol" size="2">·</font><font style="FONT-SIZE: 3pt" size="1">                 </font> <font style="FONT-SIZE: 10pt" size="2">Approximately 92% of our leases (on a rentable square footage basis) provided for the recapture of certain capital expenditures (such as HVAC systems maintenance and/or replacement, roof replacement, and parking lot resurfacing), which we believe would typically be borne by the landlord in traditional office leases; and</font></p> <p style="MARGIN: 0in 0in 0pt 0.75in; TEXT-INDENT: -0.25in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Symbol" size="2">·</font><font style="FONT-SIZE: 3pt" size="1">                 </font> <font style="FONT-SIZE: 10pt" size="2">Investment-grade client tenants represented 47% of our total annualized base rent.</font></p> <p style="MARGIN: 0in 0in 0pt 0.75in; TEXT-INDENT: -0.25in"> </p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Any references to the number of buildings, square footage, number of leases, occupancy, annualized base rent percentages, and any amounts derived from these values in the notes to the consolidated financial statements are unaudited.</font></p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"> </p></div>
CY2012Q2	dei	Entity Public Float EntityPublicFloat	4500000000	USD
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012Q4	us-gaap	Assets Assets	7150116000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	3647058000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	3441851000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7150116000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3488494000	USD
CY2011Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	6008440000	USD
CY2012	dei	Entity Registrant Name EntityRegistrantName	ALEXANDRIA REAL ESTATE EQUITIES INC
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0001035443
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	63741387	shares
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	78539000	USD
CY2011Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	23332000	USD
CY2011Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	7480000	USD
CY2011Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	142097000	USD
CY2011Q4	are	Deferred Costs Leasing And Finance Net DeferredCostsLeasingAndFinanceNet	135550000	USD
CY2011Q4	are	Equity Investments EquityInvestments	95777000	USD
CY2011Q4	us-gaap	Other Assets OtherAssets	82914000	USD
CY2011Q4	us-gaap	Assets Assets	6574129000	USD
CY2011Q4	us-gaap	Secured Debt SecuredDebt	724305000	USD
CY2011Q4	are	Unsecured Senior Notes Payable UnsecuredSeniorNotesPayable	84959000	USD
CY2011Q4	us-gaap	Line Of Credit LineOfCredit	370000000	USD
CY2011Q4	are	Unsecured Bank Term Loans UnsecuredBankTermLoans	1600000000	USD
CY2011Q4	are	Accounts Payable And Accrued Liabilities And Security Deposit Liability Current And Noncurrent AccountsPayableAndAccruedLiabilitiesAndSecurityDepositLiabilityCurrentAndNoncurrent	325393000	USD
CY2011Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	36579000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	3141236000	USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2011Q4	us-gaap	Temporary Equity Redemption Value TemporaryEquityRedemptionValue	16034000	USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	616000	USD
CY2011Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	3028558000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-34511000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	3374301000	USD
CY2011Q4	us-gaap	Minority Interest MinorityInterest	42558000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3416859000	USD
CY2012	us-gaap	Use Of Estimates UseOfEstimates	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="MARGIN: 0in 0in 0pt"><i><font style="FONT-SIZE: 10pt; FONT-STYLE: italic; FONT-FAMILY: Times New Roman" size="2">Use of estimates</font></i></p> <p style="MARGIN: 0in 0in 0pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"> </font></p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">The preparation of consolidated financial statements in conformity with United States generally accepted accounting principles (“GAAP”) requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, and equity; the disclosure of contingent assets and liabilities as of the date of the consolidated financial statements; and the amounts of revenues and expenses during the reporting period.  Actual results could materially differ from those estimates.</font></p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"> </font></p></div>
CY2012	us-gaap	Comparability Of Prior Year Financial Data ComparabilityOfPriorYearFinancialData	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="MARGIN: 0in 0in 0pt"><i><font style="FONT-SIZE: 10pt; FONT-STYLE: italic; FONT-FAMILY: Times New Roman" size="2">Reclassifications</font></i></p> <p style="MARGIN: 0in 0in 0pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"> </font></p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Certain prior period amounts have been reclassified to conform to the current period presentation.</font></p> <p style="MARGIN: 0in 0in 0pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"> </font></p></div>
CY2011Q4	us-gaap	Accumulated Amortization Deferred Finance Costs AccumulatedAmortizationDeferredFinanceCosts	51081000	USD
CY2012	us-gaap	Derivatives Methods Of Accounting Hedging Derivatives DerivativesMethodsOfAccountingHedgingDerivatives	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="MARGIN: 0in 0in 0pt"><i><font style="FONT-SIZE: 10pt; FONT-STYLE: italic; FONT-FAMILY: Times New Roman" size="2">Interest rate swap agreements</font></i></p> <p style="MARGIN: 0in 0in 0pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"> </font></p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">We are exposed to certain risks arising from both our business operations and economic conditions.  We principally manage our exposures to a wide variety of business and operational risks through management of our core business activities.  We manage economic risks, including interest rate, liquidity, and credit risk, primarily by managing the amount, sources, and duration of our debt funding and the use of interest rate swap agreements.  Specifically, we enter into interest rate swap agreements to manage exposures that arise from business activities that result in the payment of future known and uncertain cash amounts, the value of which are determined by interest rates.  Our interest rate swap agreements are used to manage differences in the amount, timing, and duration of our known or expected cash payments principally related to our borrowings based on LIBOR.  We do not use derivatives for trading or speculative purposes and currently all of our derivatives are designated as hedges.  Our objectives in using interest rate swap agreements are to add stability to interest expense and to manage our exposure to interest rate movements in accordance with our interest rate risk management strategy.  Interest rate swap agreements designated as cash flow hedges involve the receipt of variable rate amounts from a counterparty in exchange for the Company making fixed rate payments over the life of the interest rate swap agreements without exchange of the underlying notional amount of interest rate swap agreements.</font></p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"> </font></p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">We utilize interest rate swap agreements, including interest rate swap agreements, to hedge a portion of our exposure to variable interest rates primarily associated with our unsecured senior line of credit and unsecured senior bank term loans.  We recognize our interest rate swap agreements as either assets or liabilities on the balance sheet at fair value.  The accounting for changes in fair value (i.e., gains or losses) of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and, further, on the type of hedging relationship.  For those derivative instruments that are designated and qualify as hedging instruments, a company must designate the hedging instrument, based on the hedged exposure, as a fair value hedge, a cash flow hedge, or a hedge of a net investment in a foreign operation.  We do not use derivatives for trading or speculative purposes and currently all of our derivatives are designated as hedges.  Our interest rate swap agreements are considered cash flow hedges because they are designated and qualify as hedges of the exposure to variability in expected future cash flows.  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 in the earnings effect of the hedged transactions in a cash flow hedge.  All of our interest rate swap agreements meet the criteria to be deemed “highly effective” in reducing our exposure to variable interest rates.  We formally document all relationships between interest rate swap agreements and hedged items, including the method for evaluating effectiveness and the risk strategy.  We make an assessment at the inception of each interest rate swap agreement and on an ongoing basis to determine whether these instruments are “highly effective” in offsetting changes in cash flows associated with the hedged items.  The ineffective portion of each interest rate swap agreement is immediately recognized in earnings.  While we intend to continue to meet the conditions for such hedge accounting, if swaps did not qualify as “highly effective,” the changes in the fair values of the derivatives used as hedges would be reflected in earnings.</font></p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"> </font></p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Interest rate swap agreements designated as cash flow hedges involve the receipt of variable rate amounts from a counterparty in exchange for the Company making fixed rate payments over the life of the interest rate swap agreements without exchange of the underlying notional amount of interest rate swap agreements.</font></p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"> </font></p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">The effective portion of changes in the fair value of our interest rate swap agreements that are designated and that qualify as cash flow hedges is recognized in accumulated other comprehensive income.  Amounts classified in accumulated other comprehensive income will be reclassified into earnings in the period during which the hedged transactions affect earnings.</font></p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"> </font></p> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">The fair value of each interest rate swap agreement is determined using widely accepted valuation techniques including discounted cash flow analyses on the expected cash flows of each derivative.  These analyses reflect the contractual terms of the derivatives, including the period to maturity, and use observable market-based inputs, including interest rate curves and implied volatilities (also referred to as “significant other observable inputs”).  The fair values of our interest rate swap agreements are determined using the market standard methodology of netting the discounted future fixed cash payments and the discounted expected variable cash receipts.  The variable cash receipts are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves.  The fair value calculation also includes an amount for risk of non-performance using “significant unobservable inputs” such as estimates of current credit spreads to evaluate the likelihood of default, which we have determined to be insignificant to the overall fair value of our interest rate swap agreements.</font></p> <p style="MARGIN: 0in 0in 0pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"> </font></p></div>
CY2012	are	Maximum Expected Period Of Sale Of Property MaximumExpectedPeriodOfSaleOfProperty	P1Y
CY2012	are	Concentration Risk Fdic Insurance Coverage ConcentrationRiskFDICInsuranceCoverage	250000	USD
CY2012Q4	are	Cost Method Investment Ownership Percentage CostMethodInvestmentOwnershipPercentage	0.10	pure
CY2011Q4	are	Cost Method Investment Ownership Percentage CostMethodInvestmentOwnershipPercentage	0.10	pure
CY2012	us-gaap	Interest Income Operating InterestIncomeOperating	3400000	USD
CY2011	us-gaap	Interest Income Operating InterestIncomeOperating	900000	USD
CY2010	us-gaap	Interest Income Operating InterestIncomeOperating	800000	USD
CY2011Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	31016000	USD
CY2012Q4	us-gaap	Land Land	522664000	USD
CY2011Q4	us-gaap	Land Land	510630000	USD
CY2012Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	4933314000	USD
CY2011Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	4417093000	USD
CY2012Q4	are	Improvements Others ImprovementsOthers	189793000	USD
CY2011Q4	are	Improvements Others ImprovementsOthers	185036000	USD
CY2012Q4	us-gaap	Rental Properties RentalProperties	5645771000	USD
CY2011Q4	us-gaap	Rental Properties RentalProperties	5112759000	USD
CY2012Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	875035000	USD
CY2011Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	742535000	USD
CY2012Q4	are	Rental Properties Net RentalPropertiesNet	4770736000	USD
CY2011Q4	are	Rental Properties Net RentalPropertiesNet	4370224000	USD
CY2012Q4	us-gaap	Real Estate Investments Unconsolidated Real Estate And Other Joint Ventures RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures	28656000	USD
CY2011Q4	us-gaap	Real Estate Investments Unconsolidated Real Estate And Other Joint Ventures RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures	42342000	USD
CY2012Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	6424578000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Current OperatingLeasesFutureMinimumPaymentsReceivableCurrent	466826000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Two Years OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears	461457000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Three Years OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears	430860000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Four Years OperatingLeasesFutureMinimumPaymentsReceivableInFourYears	391826000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Five Years OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears	337602000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Thereafter OperatingLeasesFutureMinimumPaymentsReceivableThereafter	1551205000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Receivable OperatingLeasesFutureMinimumPaymentsReceivable	3639776000	USD
CY2012Q4	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	250071000	USD
CY2012Q4	us-gaap	Deferred Costs Leasing Accumulated Amortization DeferredCostsLeasingAccumulatedAmortization	127005000	USD
CY2012Q4	us-gaap	Deferred Costs Leasing Net DeferredCostsLeasingNet	123066000	USD
CY2012Q4	us-gaap	Deferred Finance Costs Gross DeferredFinanceCostsGross	100202000	USD
CY2012Q4	us-gaap	Accumulated Amortization Deferred Finance Costs AccumulatedAmortizationDeferredFinanceCosts	63220000	USD
CY2012Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	36982000	USD
CY2011Q4	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	204124000	USD
CY2011Q4	us-gaap	Deferred Costs Leasing Accumulated Amortization DeferredCostsLeasingAccumulatedAmortization	99590000	USD
CY2011Q4	us-gaap	Deferred Costs Leasing Net DeferredCostsLeasingNet	104534000	USD
CY2011Q4	us-gaap	Deferred Finance Costs Gross DeferredFinanceCostsGross	82097000	USD
CY2012Q4	us-gaap	Available For Sale Equity Securities Amortized Cost Basis AvailableForSaleEquitySecuritiesAmortizedCostBasis	1236000	USD
CY2012Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	1561000	USD
CY2012Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	88000	USD
CY2012Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	2709000	USD
CY2012Q4	us-gaap	Cost Method Investments CostMethodInvestments	112333000	USD
CY2012Q4	us-gaap	Equity Method Investments EquityMethodInvestments	6000	USD
CY2012Q4	are	Equity Investments EquityInvestments	115048000	USD
CY2011Q4	us-gaap	Available For Sale Equity Securities Amortized Cost Basis AvailableForSaleEquitySecuritiesAmortizedCostBasis	2401000	USD
CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	4206000	USD
CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	372000	USD
CY2011Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	6235000	USD
CY2011Q4	us-gaap	Cost Method Investments CostMethodInvestments	89510000	USD
CY2011Q4	us-gaap	Equity Method Investments EquityMethodInvestments	32000	USD
CY2012	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	-26000	USD
CY2012	are	Reclassification From Accumulated Other Comprehensive Income To Realized Gains Net Reclassification From Accumulated Other Comprehensive Income To Realized Gains Net ReclassificationFromAccumulatedOtherComprehensiveIncomeToRealizedGainsNetReclassificationFromAccumulatedOtherComprehensiveIncomeToRealizedGainsNet	3351000	USD
CY2012	are	Equity Method Investment Gross Realized Gains EquityMethodInvestmentGrossRealizedGains	15018000	USD
CY2012	are	Equity Method Investment Gross Realized Losses EquityMethodInvestmentGrossRealizedLosses	2611000	USD
CY2012	us-gaap	Investment Income Net InvestmentIncomeNet	12381000	USD
CY2011	are	Equity Method Investment Gross Realized Gains EquityMethodInvestmentGrossRealizedGains	4846000	USD
CY2010	are	Equity Method Investment Gross Realized Gains EquityMethodInvestmentGrossRealizedGains	2302000	USD
CY2011	are	Equity Method Investment Gross Realized Losses EquityMethodInvestmentGrossRealizedLosses	1795000	USD
CY2010	are	Equity Method Investment Gross Realized Losses EquityMethodInvestmentGrossRealizedLosses	303000	USD
CY2011	us-gaap	Investment Income Net InvestmentIncomeNet	3051000	USD
CY2010	us-gaap	Investment Income Net InvestmentIncomeNet	2047000	USD
CY2011	are	Reclassification From Accumulated Other Comprehensive Income To Realized Gains Net Reclassification From Accumulated Other Comprehensive Income To Realized Gains Net ReclassificationFromAccumulatedOtherComprehensiveIncomeToRealizedGainsNetReclassificationFromAccumulatedOtherComprehensiveIncomeToRealizedGainsNet	2561000	USD
CY2010	are	Reclassification From Accumulated Other Comprehensive Income To Realized Gains Net Reclassification From Accumulated Other Comprehensive Income To Realized Gains Net ReclassificationFromAccumulatedOtherComprehensiveIncomeToRealizedGainsNetReclassificationFromAccumulatedOtherComprehensiveIncomeToRealizedGainsNet	1415000	USD
CY2011Q4	are	Deferred Rent Liability DeferredRentLiability	30493000	USD
CY2012Q4	us-gaap	Longterm Debt Percentage Bearing Fixed Interest Amount LongtermDebtPercentageBearingFixedInterestAmount	2222538000	USD
CY2012Q4	us-gaap	Longterm Debt Percentage Bearing Variable Interest Amount LongtermDebtPercentageBearingVariableInterestAmount	959411000	USD
CY2012Q4	us-gaap	Long Term Debt LongTermDebt	3181949000	USD
CY2012Q4	are	Debt Instrument Percentage Of Outstanding Balance DebtInstrumentPercentageOfOutstandingBalance	1.000	pure
CY2012Q4	us-gaap	Debt Weighted Average Interest Rate DebtWeightedAverageInterestRate	0.0365	pure
CY2012	are	Debt Instrument Weighted Average Remaining Period DebtInstrumentWeightedAverageRemainingPeriod	P4Y8M12D
CY2012Q4	are	Fixed Interest Rate Debt As Percentage Of Total Outstanding Balance FixedInterestRateDebtAsPercentageOfTotalOutstandingBalance	0.70	pure
CY2012Q4	are	Variable Interest Rate Debt As Percentage Of Total Outstanding Balance VariableInterestRateDebtAsPercentageOfTotalOutstandingBalance	0.30	pure
CY2012Q4	are	Debt Instrument Debt Interest Rate Basis For Effective Rate DebtInstrumentDebtInterestRateBasisForEffectiveRate	0.0365	pure
CY2012Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	868000	USD
CY2012Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	3182817000	USD
CY2012Q4	are	Debt Instruments Balloon Payment Amount DebtInstrumentsBalloonPaymentAmount	3145566000	USD
CY2012Q4	are	Principal Amortization Of Unsecured Debt PrincipalAmortizationOfUnsecuredDebt	36383000	USD
CY2012	us-gaap	Interest Costs Incurred InterestCostsIncurred	131935000	USD
CY2012	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	-62751000	USD
CY2012	are	Interest Expense Continuing And Discontinuing Operations InterestExpenseContinuingAndDiscontinuingOperations	69184000	USD
CY2011	us-gaap	Interest Costs Incurred InterestCostsIncurred	124499000	USD
CY2011	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	-61056000	USD
CY2011	are	Interest Expense Continuing And Discontinuing Operations InterestExpenseContinuingAndDiscontinuingOperations	63443000	USD
CY2010	us-gaap	Interest Costs Incurred InterestCostsIncurred	142477000	USD
CY2010	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	-72835000	USD
CY2010	are	Interest Expense Continuing And Discontinuing Operations InterestExpenseContinuingAndDiscontinuingOperations	69642000	USD
CY2012Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	105520000	USD
CY2012Q4	us-gaap	Construction Payable Current And Noncurrent ConstructionPayableCurrentAndNoncurrent	83104000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	-14721000	USD
CY2012Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	9240000	USD
CY2012Q4	are	Deferred Rent Liability DeferredRentLiability	34414000	USD
CY2012Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	20661000	USD
CY2012Q4	are	Prepaid Rent And Tenant Security Deposits PrepaidRentAndTenantSecurityDeposits	143878000	USD
CY2012Q4	us-gaap	Other Accounts Payable And Accrued Liabilities OtherAccountsPayableAndAccruedLiabilities	12170000	USD
CY2012Q4	are	Accounts Payable And Accrued Liabilities And Security Deposit Liability Current And Noncurrent AccountsPayableAndAccruedLiabilitiesAndSecurityDepositLiabilityCurrentAndNoncurrent	423708000	USD
CY2011Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	86419000	USD
CY2011Q4	us-gaap	Construction Payable Current And Noncurrent ConstructionPayableCurrentAndNoncurrent	37016000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	-17921000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	10215000	USD
CY2011Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	32980000	USD
CY2011Q4	are	Prepaid Rent And Tenant Security Deposits PrepaidRentAndTenantSecurityDeposits	103486000	USD
CY2011Q4	us-gaap	Other Accounts Payable And Accrued Liabilities OtherAccountsPayableAndAccruedLiabilities	6863000	USD
CY2011	are	Percentage Of Effective Portion Of Interest Rate Hedge Agreements PercentageOfEffectivePortionOfInterestRateHedgeAgreements	1.00	pure
CY2012	are	Percentage Of Effective Portion Of Interest Rate Hedge Agreements PercentageOfEffectivePortionOfInterestRateHedgeAgreements	1.00	pure
CY2012Q4	us-gaap	Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months Net InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet	15100000	USD
CY2011Q4	us-gaap	Interest Rate Cash Flow Hedge Liability At Fair Value InterestRateCashFlowHedgeLiabilityAtFairValue	33000000	USD
CY2012Q4	us-gaap	Interest Rate Cash Flow Hedge Liability At Fair Value InterestRateCashFlowHedgeLiabilityAtFairValue	20700000	USD
CY2012Q4	are	Effective Portion Of Interest Rate Cash Flow Hedge Derivatives EffectivePortionOfInterestRateCashFlowHedgeDerivatives	375000000	USD
CY2012	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	46087000	USD
CY2011	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	46000	USD
CY2010	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	59400000	USD
CY2012	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	1900000	USD
CY2012	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3402000	USD
CY2012	us-gaap	Dividends Preferred Stock DividendsPreferredStock	27328000	USD
CY2012	us-gaap	Preferred Stock Redemption Premium PreferredStockRedemptionPremium	5978000	USD
CY2012	us-gaap	Undistributed Earnings Allocated To Participating Securities UndistributedEarningsAllocatedToParticipatingSecurities	1190000	USD
CY2011	us-gaap	Undistributed Earnings Allocated To Participating Securities UndistributedEarningsAllocatedToParticipatingSecurities	1088000	USD
CY2010	us-gaap	Undistributed Earnings Allocated To Participating Securities UndistributedEarningsAllocatedToParticipatingSecurities	995000	USD
CY2012	are	Net Income Loss Available To Common Stockholders NetIncomeLossAvailableToCommonStockholders	65412000	USD
CY2011	are	Net Income Loss Available To Common Stockholders NetIncomeLossAvailableToCommonStockholders	91207000	USD
CY2010	are	Net Income Loss Available To Common Stockholders NetIncomeLossAvailableToCommonStockholders	93444000	USD
CY2012	are	Income Loss From Discontinued Operations Before Impairment Of Real Estate IncomeLossFromDiscontinuedOperationsBeforeImpairmentOfRealEstate	13618000	USD
CY2011	are	Income Loss From Discontinued Operations Before Impairment Of Real Estate IncomeLossFromDiscontinuedOperationsBeforeImpairmentOfRealEstate	11760000	USD
CY2010	are	Income Loss From Discontinued Operations Before Impairment Of Real Estate IncomeLossFromDiscontinuedOperationsBeforeImpairmentOfRealEstate	12497000	USD
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	2218000	USD
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	62159913	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	59066812	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48375474	shares
CY2012	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	331	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	10798	shares
CY2010	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	29566	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	62160244	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	59077610	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48405040	shares
CY2012	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.05
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.04
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.09
CY2012	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.05
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.04
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.09
CY2011	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.55
CY2010	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.93
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.18
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.26
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.73
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.19
CY2011	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.55
CY2010	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.93
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.18
CY2011	us-gaap	Income Tax Reconciliation Disposition Of Assets IncomeTaxReconciliationDispositionOfAssets	24000	USD
CY2010	us-gaap	Income Tax Reconciliation Disposition Of Assets IncomeTaxReconciliationDispositionOfAssets	39444000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-4124000	USD
CY2010	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	616000	USD
CY2011	are	Taxable Income Before Dividend Deduction TaxableIncomeBeforeDividendDeduction	132160000	USD
CY2010	are	Taxable Income Before Dividend Deduction TaxableIncomeBeforeDividendDeduction	83139000	USD
CY2011	are	Dividend Deduction To Eliminate Taxable Income DividendDeductionToEliminateTaxableIncome	132160000	USD
CY2010	are	Dividend Deduction To Eliminate Taxable Income DividendDeductionToEliminateTaxableIncome	83139000	USD
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.26
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.73
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.19
CY2012	us-gaap	Net Income Loss NetIncomeLoss	99908000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	120652000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	122796000	USD
CY2012	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	102126000	USD
CY2011	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	131418000	USD
CY2010	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	135293000	USD
CY2011	are	Income Tax Reconciliation Rental Revenue Recognition IncomeTaxReconciliationRentalRevenueRecognition	-5886000	USD
CY2010	are	Income Tax Reconciliation Rental Revenue Recognition IncomeTaxReconciliationRentalRevenueRecognition	-15740000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation And Amortization IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortization	3705000	USD
CY2010	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation And Amortization IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortization	1410000	USD
CY2011	are	Income Tax Reconciliation Gains Losses From Capital Transaction IncomeTaxReconciliationGainsLossesFromCapitalTransaction	283000	USD
CY2010	are	Income Tax Reconciliation Gains Losses From Capital Transaction IncomeTaxReconciliationGainsLossesFromCapitalTransaction	-4782000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-8249000	USD
CY2010	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-6179000	USD
CY2011	are	Income Tax Reconciliation Nondeductible Expense Interest Expense IncomeTaxReconciliationNondeductibleExpenseInterestExpense	2299000	USD
CY2010	are	Income Tax Reconciliation Nondeductible Expense Interest Expense IncomeTaxReconciliationNondeductibleExpenseInterestExpense	-3659000	USD
CY2011	us-gaap	Payments Of Dividends PaymentsOfDividends	135200000	USD
CY2010	us-gaap	Payments Of Dividends PaymentsOfDividends	96200000	USD
CY2012	are	Minimum Percentage Of Taxable Income To Be Distributed MinimumPercentageOfTaxableIncomeToBeDistributed	1.00	pure
CY2012	are	Percent Of Taxable Income Generally Distributed As Dividend PercentOfTaxableIncomeGenerallyDistributedAsDividend	1.00	pure
CY2011	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1300000	USD
CY2010	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1400000	USD
CY2012	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1400000	USD
CY2012	are	Number Of Leases Held NumberOfLeasesHeld	494	lease
CY2012	are	Number Of Tenants NumberOfTenants	396	tenant
CY2012	are	Number Of Properties Leased NumberOfPropertiesLeased	178	property
CY2012Q4	are	Remaining Aggregate Costs Under Contracts RemainingAggregateCostsUnderContracts	239400000	USD
CY2012Q4	are	Fund Commitment On Investment FundCommitmentOnInvestment	55800000	USD
CY2012	are	Fund Commitment On Investment Period FundCommitmentOnInvestmentPeriod	P6Y
CY2011	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	10200000	USD
CY2010	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	8800000	USD
CY2012Q4	are	Ground Lease Obligation Due GroundLeaseObligationDue	662902000	USD
CY2012Q4	are	Ground And Operating Lease Obligation Due Within One Year GroundAndOperatingLeaseObligationDueWithinOneYear	11754000	USD
CY2012Q4	are	Ground And Operating Lease Obligation Due In Second Year GroundAndOperatingLeaseObligationDueInSecondYear	10590000	USD
CY2012Q4	are	Ground And Operating Lease Obligation Due In Third Year GroundAndOperatingLeaseObligationDueInThirdYear	10490000	USD
CY2012Q4	are	Ground And Operating Lease Obligation Due In Fourth Year GroundAndOperatingLeaseObligationDueInFourthYear	11198000	USD
CY2012Q4	are	Ground And Operating Lease Obligation Due In Fifth Year GroundAndOperatingLeaseObligationDueInFifthYear	11310000	USD
CY2012Q4	are	Ground And Operating Lease Obligation Due After Fifth Year GroundAndOperatingLeaseObligationDueAfterFifthYear	613895000	USD
CY2012Q4	are	Ground And Operating Lease Obligation Due GroundAndOperatingLeaseObligationDue	669237000	USD
CY2012	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	10600000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	804000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	841000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	886000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	924000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	969000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	1911000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	6335000	USD
CY2012Q4	are	Ground Lease Obligation Due Within One Year GroundLeaseObligationDueWithinOneYear	10950000	USD
CY2012Q4	are	Ground Lease Obligation Due In Second Year GroundLeaseObligationDueInSecondYear	9749000	USD
CY2012Q4	are	Ground Lease Obligation Due In Third Year GroundLeaseObligationDueInThirdYear	9604000	USD
CY2012Q4	are	Ground Lease Obligation Due In Fourth Year GroundLeaseObligationDueInFourthYear	10274000	USD
CY2012Q4	are	Ground Lease Obligation Due In Fifth Year GroundLeaseObligationDueInFifthYear	10341000	USD
CY2012Q4	are	Ground Lease Obligation Due After Fifth Year GroundLeaseObligationDueAfterFifthYear	611984000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1473000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	3834000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-20661000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-32980000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-5645000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-5365000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-24833000	USD
CY2012	are	Preferred Stock Shares Additional Shares Authorized PreferredStockSharesAdditionalSharesAuthorized	200000000	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	1706142	shares
CY2012Q4	us-gaap	Disposal Group Including Discontinued Operation Property Plant And Equipment Net DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNet	76440000	USD
CY2012Q4	us-gaap	Disposal Group Including Discontinued Operation Other Assets DisposalGroupIncludingDiscontinuedOperationOtherAssets	4546000	USD
CY2012Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	80986000	USD
CY2012Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	3233000	USD
CY2012Q4	are	Net Assets Of Disposal Group Including Discontinued Operation NetAssetsOfDisposalGroupIncludingDiscontinuedOperation	77753000	USD
CY2011Q4	us-gaap	Disposal Group Including Discontinued Operation Property Plant And Equipment Net DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNet	88408000	USD
CY2011Q4	us-gaap	Disposal Group Including Discontinued Operation Other Assets DisposalGroupIncludingDiscontinuedOperationOtherAssets	4176000	USD
CY2011Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	92584000	USD
CY2011Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	3532000	USD
CY2011Q4	are	Net Assets Of Disposal Group Including Discontinued Operation NetAssetsOfDisposalGroupIncludingDiscontinuedOperation	89052000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	24706000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	9496000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	15210000	USD
CY2012	are	Discontinued Operations Depreciation Expense DiscontinuedOperationsDepreciationExpense	3156000	USD
CY2012	us-gaap	Gain Loss On Disposition Of Real Estate Discontinued Operations GainLossOnDispositionOfRealEstateDiscontinuedOperations	1564000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	26298000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	9534000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	16764000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Interest Expense DisposalGroupIncludingDiscontinuedOperationInterestExpense	65000	USD
CY2011	are	Discontinued Operations Depreciation Expense DiscontinuedOperationsDepreciationExpense	4939000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	27476000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	9437000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	18039000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Interest Expense DisposalGroupIncludingDiscontinuedOperationInterestExpense	133000	USD
CY2010	are	Discontinued Operations Depreciation Expense DiscontinuedOperationsDepreciationExpense	5433000	USD
CY2012	are	Disposal Group Including Discontinued Operation Operating Properties Held For Sale Number DisposalGroupIncludingDiscontinuedOperationOperatingPropertiesHeldForSaleNumber	4	property
CY2011	are	Disposal Group Including Discontinued Operation Operating Properties Held For Sale Number DisposalGroupIncludingDiscontinuedOperationOperatingPropertiesHeldForSaleNumber	4	property
CY2012	are	Disposal Group Including Discontinued Operation Properties Sold Number DisposalGroupIncludingDiscontinuedOperationPropertiesSoldNumber	6	property
CY2011	are	Disposal Group Including Discontinued Operation Properties Sold Number DisposalGroupIncludingDiscontinuedOperationPropertiesSoldNumber	1	property
CY2012Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	6100000	USD
CY2012Q1	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	138432000	USD
CY2012Q1	are	Net Income Loss Attributable To Common Stockholders NetIncomeLossAttributableToCommonStockholders	18368000	USD
CY2012Q2	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	148016000	USD
CY2012Q2	are	Net Income Loss Attributable To Common Stockholders NetIncomeLossAttributableToCommonStockholders	17616000	USD
CY2012Q3	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	145455000	USD
CY2012Q3	are	Net Income Loss Attributable To Common Stockholders NetIncomeLossAttributableToCommonStockholders	10646000	USD
CY2012Q4	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	154170000	USD
CY2012Q4	are	Net Income Loss Attributable To Common Stockholders NetIncomeLossAttributableToCommonStockholders	21000000	USD
CY2011Q1	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	133496000	USD
CY2011Q2	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	137426000	USD
CY2011Q3	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	138054000	USD
CY2011Q4	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	139249000	USD
CY2011Q1	are	Net Income Loss Attributable To Common Stockholders NetIncomeLossAttributableToCommonStockholders	24365000	USD
CY2011Q2	are	Net Income Loss Attributable To Common Stockholders NetIncomeLossAttributableToCommonStockholders	25986000	USD
CY2011Q3	are	Net Income Loss Attributable To Common Stockholders NetIncomeLossAttributableToCommonStockholders	24662000	USD
CY2011Q4	are	Net Income Loss Attributable To Common Stockholders NetIncomeLossAttributableToCommonStockholders	26960000	USD
CY2012	us-gaap	Subsidiary Or Equity Method Investee Cumulative Percentage Ownership After All Transactions SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions	1.00	pure
CY2012Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	39947000	USD
CY2012Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	8449000	USD
CY2012Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	170396000	USD
CY2012Q4	are	Deferred Costs Leasing And Finance Net DeferredCostsLeasingAndFinanceNet	160048000	USD
CY2012Q4	us-gaap	Other Assets OtherAssets	90679000	USD
CY2012Q4	us-gaap	Secured Debt SecuredDebt	716144000	USD
CY2012Q4	are	Unsecured Senior Notes Payable UnsecuredSeniorNotesPayable	549805000	USD
CY2012Q4	us-gaap	Line Of Credit LineOfCredit	566000000	USD
CY2012Q4	are	Unsecured Bank Term Loans UnsecuredBankTermLoans	1350000000	USD
CY2012Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	41401000	USD
CY2012Q4	us-gaap	Temporary Equity Redemption Value TemporaryEquityRedemptionValue	14564000	USD
CY2012Q4	us-gaap	Minority Interest MinorityInterest	46643000	USD
CY2012	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	432452000	USD
CY2012	us-gaap	Tenant Reimbursements TenantReimbursements	135186000	USD
CY2012	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	18435000	USD
CY2012	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	174523000	USD
CY2012	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	47795000	USD
CY2012	us-gaap	Interest Expense InterestExpense	69184000	USD
CY2012	us-gaap	Depreciation And Amortization DepreciationAndAmortization	188850000	USD
CY2012	us-gaap	Participating Securities Distributed And Undistributed Earnings ParticipatingSecuritiesDistributedAndUndistributedEarnings	1190000	USD
CY2011	are	Income Loss From Continuing Operations Before Income Taxes Minority Interest Equity In Earnings Of Affiliates And Gain Loss On Early Extinguishment Of Debt IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestEquityInEarningsOfAffiliatesAndGainLossOnEarlyExtinguishmentOfDebt	124581000	USD
CY2010	are	Income Loss From Continuing Operations Before Income Taxes Minority Interest Equity In Earnings Of Affiliates And Gain Loss On Early Extinguishment Of Debt IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestEquityInEarningsOfAffiliatesAndGainLossOnEarlyExtinguishmentOfDebt	67083000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	990000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-3351000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-2361000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-9990000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	22309000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	3364000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-2323000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-1123000	USD
CY2012	are	Depreciation And Amortization Cash Flow Impact DepreciationAndAmortizationCashFlowImpact	192005000	USD
CY2012	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	9832000	USD
CY2012	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	511000	USD
CY2012	are	Amortization Of Above Below Market Leases AmortizationOfAboveBelowMarketLeases	3200000	USD
CY2012	us-gaap	Straight Line Rent StraightLineRent	28456000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	14160000	USD
CY2012	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-26000	USD
CY2012	us-gaap	Gain On Sale Of Investments GainOnSaleOfInvestments	15018000	USD
CY2012	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	2611000	USD
CY2012	us-gaap	Increase Decrease In Restricted Cash For Operating Activities IncreaseDecreaseInRestrictedCashForOperatingActivities	261000	USD
CY2012	us-gaap	Increase Decrease In Leasing Receivables IncreaseDecreaseInLeasingReceivables	981000	USD
CY2012	us-gaap	Increase Decrease In Deferred Leasing Fees IncreaseDecreaseInDeferredLeasingFees	45099000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	4069000	USD
CY2012	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	65697000	USD
CY2012	us-gaap	Proceeds From Sale Of Property Held For Sale ProceedsFromSaleOfPropertyHeldForSale	36179000	USD
CY2012	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	549030000	USD
CY2012	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	42171000	USD
CY2012	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	9377000	USD
CY2012	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	6700000	USD
CY2012	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	36294000	USD
CY2012	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	27043000	USD
CY2012	us-gaap	Repayments Of Convertible Debt RepaymentsOfConvertibleDebt	84801000	USD
CY2012	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	651147000	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	97890000	USD
CY2012	us-gaap	Proceeds From Repayments Of Restricted Cash Financing Activities ProceedsFromRepaymentsOfRestrictedCashFinancingActivities	-7428000	USD
CY2012	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	13225000	USD
CY2012	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	155000	USD
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	126498000	USD
CY2012	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	27819000	USD
CY2012	us-gaap	Payments Of Distributions To Affiliates PaymentsOfDistributionsToAffiliates	1249000	USD
CY2012	us-gaap	Payments For Repurchase Of Redeemable Noncontrolling Interest PaymentsForRepurchaseOfRedeemableNoncontrollingInterest	450000	USD
CY2012	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	1875000	USD
CY2012	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	913000	USD
CY2012	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	139000	USD
CY2012	us-gaap	Interest Paid Net InterestPaidNet	52561000	USD
CY2011	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	66849000	USD
CY2011	are	Repayments Of Unsecured Bank Term Loans RepaymentsOfUnsecuredBankTermLoans	500000000	USD
CY2010	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	129938000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Per Basic And Diluted Share IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	1.05
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic And Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	0.04
CY2012	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	1.09
CY2012	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	101446000	USD
CY2011	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-5230000	USD
CY2010	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	431000	USD
CY2012	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	-694000	USD
CY2012Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	100000000	shares
CY2012Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	15200000	shares
CY2012Q4	are	Triple Net Leases Percentage TripleNetLeasesPercentage	0.94	pure
CY2012Q4	are	Percentage Of Leases Containing Effective Annual Rent Escalation PercentageOfLeasesContainingEffectiveAnnualRentEscalation	0.96	pure
CY2012Q4	are	Percentage Of Leases Providing For Recapture Of Capital Expenditures PercentageOfLeasesProvidingForRecaptureOfCapitalExpenditures	0.92	pure
CY2010	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	48000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	124581000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	67083000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	10766000	USD
CY2011	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	1406000000	USD
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	632000	USD
CY2012Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	3086052000	USD
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	12497000	USD
CY2012	us-gaap	Profit Loss ProfitLoss	105528000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Per Basic And Diluted Share IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	1.93
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic And Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	0.18
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic And Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	0.26
CY2010	us-gaap	Cash Divested From Deconsolidation CashDivestedFromDeconsolidation	154000	USD
CY2011	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	9000	USD
CY2010	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	674000	USD
CY2013Q4	are	Effective Portion Of Interest Rate Cash Flow Hedge Derivatives EffectivePortionOfInterestRateCashFlowHedgeDerivatives	700000000	USD
CY2011	are	Number Of Leases Held NumberOfLeasesHeld	474	lease
CY2011	are	Number Of Tenants NumberOfTenants	388	tenant
CY2011	are	Number Of Properties Leased NumberOfPropertiesLeased	173	property
CY2012	are	Number Of Properties Under Ground Leased NumberOfPropertiesUnderGroundLeased	25	property
CY2012	are	Number Of Land Development Parcels Under Ground Leased NumberOfLandDevelopmentParcelsUnderGroundLeased	4	property
CY2012Q1	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.30
CY2012Q2	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.29
CY2012Q3	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.17
CY2012Q4	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.33
CY2011Q1	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.44
CY2011Q2	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.44
CY2011Q3	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.40
CY2011Q4	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.44
CY2012	are	Income Loss From Continuing Operations Before Income Taxes Minority Interest Equity In Earnings Of Affiliates And Gain Loss On Early Extinguishment Of Debt IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestEquityInEarningsOfAffiliatesAndGainLossOnEarlyExtinguishmentOfDebt	101446000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	246960000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	227006000	USD
CY2012	are	Impairment Of Land Parcel ImpairmentOfLandParcel	2050000	USD
CY2012	us-gaap	Preferred Stock Accretion Of Redemption Discount PreferredStockAccretionOfRedemptionDiscount	5978000	USD
CY2010	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	854000000	USD
CY2011	are	Proceeds From Unsecured Bank Term Loans ProceedsFromUnsecuredBankTermLoans	1350000000	USD
CY2012	are	Disposal Group Including Discontinued Operation Impairment Of Real Estate DisposalGroupIncludingDiscontinuedOperationImpairmentOfRealEstate	11400000	USD
CY2011	are	Disposal Group Including Discontinued Operation Impairment Of Real Estate DisposalGroupIncludingDiscontinuedOperationImpairmentOfRealEstate	994000	USD
CY2012	are	Rentable Square Feet Properties Number RentableSquareFeetPropertiesNumber	178	property
CY2012Q4	are	Rentable Square Footage Of Real Estate Property Operating Properties RentableSquareFootageOfRealEstatePropertyOperatingProperties	14953968
CY2012Q4	are	Square Footage Of Real Estate Property Ground Up Development SquareFootageOfRealEstatePropertyGroundUpDevelopment	1566774
CY2012Q4	are	Square Footage Of Real Estate Property Active Redevelopment SquareFootageOfRealEstatePropertyActiveRedevelopment	547092
CY2012Q4	are	Total Rentable Square Footage Of Real Estate Property TotalRentableSquareFootageOfRealEstateProperty	17067834
CY2012	are	Number Of Real Estate Properties Sold NumberOfRealEstatePropertiesSold	6	property
CY2012Q4	are	Additional Impairment Of Real Estate AdditionalImpairmentOfRealEstate	1600000	USD
CY2011	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	3492000	USD
CY2012Q3	are	Number Of Properties Sold NumberOfPropertiesSold	2	item
CY2012Q4	are	Number Of Secured Notes Repaid NumberOfSecuredNotesRepaid	2	item
CY2010	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	-3391000	USD
CY2010	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	-154000	USD
CY2009Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	3903955000	USD
CY2010Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	4546769000	USD
CY2011Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	5112759000	USD
CY2012Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	5645771000	USD
CY2012	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	42901000	USD
CY2012	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	30807000	USD
CY2012	are	Real Estate Write Off RealEstateWriteOff	17730000	USD
CY2012	us-gaap	Real Estate Other Additions RealEstateOtherAdditions	538467000	USD
CY2011	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	183720000	USD
CY2011	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	3738000	USD
CY2011	us-gaap	Real Estate Other Additions RealEstateOtherAdditions	386008000	USD
CY2010	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	258279000	USD
CY2010	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	16625000	USD
CY2010	us-gaap	Real Estate Other Additions RealEstateOtherAdditions	401160000	USD
CY2009Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	520647000	USD
CY2010Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	616007000	USD
CY2011Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	742535000	USD
CY2012Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	875035000	USD
CY2012	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	157193000	USD
CY2011	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	126528000	USD
CY2012	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	6963000	USD
CY2010	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	6805000	USD
CY2010	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	102165000	USD
CY2012	are	Operating Lease Obligation Remaining Lease Term OperatingLeaseObligationRemainingLeaseTerm	P7Y
CY2011Q2	are	Noncash Or Part Noncash Acquisition Investments Area Of Land Acquired NoncashOrPartNoncashAcquisitionInvestmentsAreaOfLandAcquired	453256
CY2011Q2	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	293000000	USD
CY2011Q2	are	Noncash Or Part Noncash Acquisition Investments Rentable Area Of Land NoncashOrPartNoncashAcquisitionInvestmentsRentableAreaOfLand	241659
CY2011Q2	are	Noncash Or Part Noncash Acquisition Investments Percentage Of Land Leased NoncashOrPartNoncashAcquisitionInvestmentsPercentageOfLandLeased	0.97	pure
CY2011Q2	are	Noncash Or Part Noncash Acquisition Investments Vacant Area Of Land NoncashOrPartNoncashAcquisitionInvestmentsVacantAreaOfLand	211597
CY2010	are	Exchange Of Unsecured Debt ExchangeOfUnsecuredDebt	-43528000	USD
CY2012Q3	are	Proceeds From Sale Of Real Estate In Cash And Receivables ProceedsFromSaleOfRealEstateInCashAndReceivables	19800000	USD
CY2012	are	Proceeds From Sale Of Real Estate In Cash And Receivables ProceedsFromSaleOfRealEstateInCashAndReceivables	75100000	USD
CY2012	are	Additional Impairment Of Real Estate AdditionalImpairmentOfRealEstate	1600000	USD
CY2012	are	Number Of Ground Lease Related To Operating Property Expiring In2036 NumberOfGroundLeaseRelatedToOperatingPropertyExpiringIn2036	1	property
CY2012	are	Number Of Operating Properties Expiring In2036 NumberOfOperatingPropertiesExpiringIn2036	1	property
CY2012Q4	are	Ground Lease Related To Operating Property Net Book Value GroundLeaseRelatedToOperatingPropertyNetBookValue	8400000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Land RealEstateAndAccumulatedDepreciationInitialCostOfLand	522666000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements	2668246000	USD
CY2012Q4	are	Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Of Building And Improvements RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionOfBuildingAndImprovements	2454860000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land RealEstateAndAccumulatedDepreciationCarryingAmountOfLand	522664000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements	5123107000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfLandAndBuildingsAndImprovements	5645771000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Accumulated Depreciation RealEstateAndAccumulatedDepreciationAccumulatedDepreciation	875035000	USD
CY2012Q4	us-gaap	Real Estate Investments RealEstateInvestments	4770736000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	716144000	USD
CY2012	are	Number Of Single Tenant Properties NumberOfSingleTenantProperties	74	item
CY2012Q4	are	Single Tenant Properties As Percentage Of Total Properties SingleTenantPropertiesAsPercentageOfTotalProperties	0.42	pure
CY2012Q4	are	Investment Grade Client Tenants As Percentage Of Total Annualized Base Rent InvestmentGradeClientTenantsAsPercentageOfTotalAnnualizedBaseRent	0.47	pure

Files In Submission

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0001104659-13-014040-index-headers.html	Edgar Link	pending
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$ARE
ALEXANDRIA REAL ESTATE EQUITIES, INC. Stock $are

2012 Form 10-K Financial Statement

#000110465913014040 Filed on February 26, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ARE ALEXANDRIA REAL ESTATE EQUITIES, INC. Stock $are

2012 Form 10-K Financial Statement

#000110465913014040 Filed on February 26, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ARE
ALEXANDRIA REAL ESTATE EQUITIES, INC. Stock $are