Debt (Summary of Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Deferred financing costs, net and other	$ (108,891)	$ (111,328)
Mortgages payable, net	9,867,550	9,513,713
Senior unsecured notes, net	845,223	844,159
Unsecured term loan, net	371,835	183,138
Unsecured revolving credit facilities	115,630	550,000
Unsecured Debt, net	1,332,688	1,577,297
Mortgages Payable [Member]
Debt Instrument [Line Items]
Mortgages payable	9,968,499	9,614,838
Deferred financing costs, net and other	(100,949)	(101,125)
Mortgages payable, net	$ 9,867,550	9,513,713
Interest Rate, End of Period (in percentage)	3.39%
Mortgages Payable [Member] \| Fixed Rate [Member]
Debt Instrument [Line Items]
Mortgages payable	$ 6,685,606	6,356,634
Interest Rate, End of Period (in percentage)	3.90%
Mortgages Payable [Member] \| Variable Rate [Member]
Debt Instrument [Line Items]
Mortgages payable	$ 3,282,893	3,258,204
Interest Rate, End of Period (in percentage)	2.34%
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Deferred financing costs, net and other	$ (4,777)	(5,841)
Unsecured debt, gross	850,000	850,000
Senior unsecured notes, net	$ 845,223	844,159
Interest Rate, End of Period (in percentage)	3.68%
Term Loan [Member]
Debt Instrument [Line Items]
Deferred financing costs, net and other	$ (3,165)	(4,362)
Unsecured debt, gross	375,000	187,500
Unsecured term loan, net	$ 371,835	183,138
Interest Rate, End of Period (in percentage)	1.67%
Unsecured Revolving Credit Facilities [Member]
Debt Instrument [Line Items]
Unsecured revolving credit facilities	$ 115,630	$ 550,000
Interest Rate, End of Period (in percentage)	1.57%

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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