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Derivative and Other Fair Value Instruments (Details Textuals) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2016
Derivative [Line Items]
Mortgage notes payable	$ 4,957,876,000us-gaap_SecuredDebt	$ 5,086,515,000us-gaap_SecuredDebt
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)	(179,700,000)us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	(172,200,000)us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net			22,200,000us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet
Unsecured Debt [Member]
Derivative [Line Items]
Unsecured Debt	5,900,000,000us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_UnsecuredDebtMember	5,800,000,000us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_UnsecuredDebtMember
Debt Instrument, Fair Value Disclosure	6,300,000,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = us-gaap_UnsecuredDebtMember	6,100,000,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = us-gaap_UnsecuredDebtMember
Secured Debt [Member]
Derivative [Line Items]
Debt Instrument, Fair Value Disclosure	$ 5,000,000,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = us-gaap_SecuredDebtMember	$ 5,100,000,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = us-gaap_SecuredDebtMember

X

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611



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-Section 50

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- Definition

The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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-Number 210

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- Definition

Amount of unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective.

+ References

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-Topic 815

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-Section 50

-Paragraph 4C

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

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-Section S99

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