Debt (Summary of Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Deferred financing costs, net and other	$ (115,192)	$ (111,328)
Total, net	9,746,818	9,513,713
Senior unsecured notes, net	844,868	844,159
Unsecured term loan, net	371,455	183,138
Unsecured revolving credit facilities	115,630	550,000
Unsecured Debt And Revolving Credit Facility	1,331,953	1,577,297
Mortgages Payable [Member]
Debt Instrument [Line Items]
Mortgages payable, gross	9,853,333	9,614,838
Deferred financing costs, net and other	(106,515)	(101,125)
Total, net	$ 9,746,818	9,513,713
Interest Rate, End of Period (in percentage)	3.54%
Mortgages Payable [Member] \| Fixed Rate [Member]
Debt Instrument [Line Items]
Mortgages payable, gross	$ 6,571,398	6,356,634
Interest Rate, End of Period (in percentage)	4.17%
Mortgages Payable [Member] \| Variable Rate [Member]
Debt Instrument [Line Items]
Mortgages payable, gross	$ 3,281,935	3,258,204
Interest Rate, End of Period (in percentage)	2.28%
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Deferred financing costs, net and other	$ (5,132)	(5,841)
Unsecured debt, gross	$ 850,000	850,000
Interest Rate, End of Period (in percentage)	3.68%
Term Loan [Member]
Debt Instrument [Line Items]
Deferred financing costs, net and other	$ (3,545)	(4,362)
Unsecured debt, gross	$ 375,000	187,500
Interest Rate, End of Period (in percentage)	1.61%
Unsecured Revolving Credit Facilities [Member]
Debt Instrument [Line Items]
Unsecured revolving credit facilities	$ 115,630	$ 550,000
Interest Rate, End of Period (in percentage)	1.51%

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

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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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