Debt (Summary of Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument
Deferred financing costs, net and other	$ (46,508)	$ (59,226)
Mortgages payable, net	6,519,189	8,167,798
Unsecured debt - Carrying amount	845,261	844,002
Unsecured term loan, net	745,076	744,821
Revolving credit facilities	530,000	80,000
Unsecured debt and revolving credit facility	$ 2,120,337	1,668,823
Mortgages
Debt Instrument
Interest rate, end of period (percent)	3.72%
Mortgages payable, gross	$ 6,556,034	8,215,847
Deferred financing costs, net and other	(36,845)	(48,049)
Mortgages payable, net	$ 6,519,189	8,167,798
Mortgages \| Fixed Rate
Debt Instrument
Interest rate, end of period (percent)	3.52%
Mortgages payable, gross	$ 4,610,526	5,003,465
Mortgages \| Variable Rate
Debt Instrument
Interest rate, end of period (percent)	4.20%
Mortgages payable, gross	$ 1,945,508	3,212,382
Senior Unsecured Notes
Debt Instrument
Interest rate, end of period (percent)	4.21%
Deferred financing costs, net and other	$ (4,739)	(5,998)
Unsecured debt, gross	850,000	850,000
Unsecured debt - Carrying amount	$ 845,261	844,002
Unsecured Term Loan
Debt Instrument
Interest rate, end of period (percent)	3.87%
Deferred financing costs, net and other	$ (4,924)	(5,179)
Unsecured debt, gross	750,000	750,000
Unsecured term loan, net	$ 745,076	744,821
Unsecured Revolving Credit Facilities
Debt Instrument
Interest rate, end of period (percent)	3.46%
Revolving credit facilities	$ 530,000	$ 80,000

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

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

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