Debt (Summary of Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument
Deferred financing costs, net and other	$ (38,407)	$ (59,226)
Total, net	5,639,897	8,167,798
Unsecured debt, net	445,872	844,002
Unsecured term loan, net	745,840	744,821
Revolving credit facilities	575,000	80,000
Long-term debt	1,766,712	1,668,823
Collateral property, net carrying value	5,600,000
Mortgages
Debt Instrument
Mortgages payable, gross	5,670,016	8,215,847
Deferred financing costs, net and other	(30,119)	(48,049)
Total, net	$ 5,639,897	8,167,798
Interest rate, end of period (in percentage)	3.48%
Mortgages \| Fixed Rate
Debt Instrument
Mortgages payable, gross	$ 4,601,516	5,003,465
Interest rate, end of period (in percentage)	3.52%
Mortgages \| Variable Rate
Debt Instrument
Mortgages payable, gross	$ 1,068,500	3,212,382
Interest rate, end of period (in percentage)	3.30%
Senior Unsecured Notes
Debt Instrument
Deferred financing costs, net and other	$ (4,128)	(5,998)
Unsecured debt, gross	450,000	850,000
Unsecured debt, net	$ 445,872	844,002
Interest rate, end of period (in percentage)	3.50%
Unsecured Debt
Debt Instrument
Deferred financing costs, net and other	$ (4,160)	(5,179)
Unsecured debt, gross	750,000	750,000
Unsecured term loan, net	$ 745,840	744,821
Interest rate, end of period (in percentage)	3.87%
Unsecured Revolving Credit Facilities
Debt Instrument
Revolving credit facilities	$ 575,000	$ 80,000
Interest rate, end of period (in percentage)	2.70%

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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