Debt (Summary of Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Deferred financing costs, net and other	$ (119,636)
Total, net	9,844,242	$ 9,513,713
Senior unsecured notes, net	844,514	844,159
Unsecured term loan, net	371,076	183,138
Unsecured revolving credit facilities	0	550,000
Unsecured Debt And Revolving Credit Facility	1,215,590	1,577,297
Mortgages Payable [Member]
Debt Instrument [Line Items]
Mortgages payable, gross	9,954,468	9,614,838
Deferred financing costs, net and other	$ (110,226)	(101,125)
Interest Rate, End of Period (in percentage)	3.46%
Mortgages Payable [Member] \| Fixed Rate [Member]
Debt Instrument [Line Items]
Mortgages payable, gross	$ 6,695,401	6,356,634
Interest Rate, End of Period (in percentage)	4.04%
Mortgages Payable [Member] \| Variable Rate [Member]
Debt Instrument [Line Items]
Mortgages payable, gross	$ 3,259,067	3,258,204
Interest Rate, End of Period (in percentage)	2.25%
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Deferred financing costs, net and other	$ (5,486)	(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	$ (3,924)	(4,362)
Unsecured debt, gross	$ 375,000	187,500
Interest Rate, End of Period (in percentage)	1.58%
Unsecured Revolving Credit Facilities [Member]
Debt Instrument [Line Items]
Unsecured revolving credit facilities	$ 0	$ 550,000

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

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