Debt (Summary of Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument
Deferred financing costs, net and other	$ (59,226)	$ (74,352)
Total, net	8,167,798	8,137,139
Unsecured debt, net	844,002	843,614
Unsecured term loan, net	744,821	748,734
Revolving credit facilities	80,000	0
Long-term Debt	1,668,823	1,592,348
Collateral property, net carrying value	9,100,000
Mortgages
Debt Instrument
Mortgages payable, gross	8,215,847	8,203,839
Deferred financing costs, net and other	(48,049)	(66,700)
Total, net	$ 8,167,798	8,137,139
Interest rate, end of period (in percentage)	3.84%
Mortgages \| Fixed Rate
Debt Instrument
Mortgages payable, gross	$ 5,003,465	5,461,706
Interest rate, end of period (in percentage)	3.53%
Mortgages \| Variable Rate
Debt Instrument
Mortgages payable, gross	$ 3,212,382	2,742,133
Interest rate, end of period (in percentage)	4.33%
Senior Unsecured Notes
Debt Instrument
Deferred financing costs, net and other	$ (5,998)	(6,386)
Unsecured debt, gross	850,000	850,000
Unsecured debt, net	$ 844,002	843,614
Interest rate, end of period (in percentage)	4.21%
Unsecured Debt
Debt Instrument
Deferred financing costs, net and other	$ (5,179)	(1,266)
Unsecured debt, gross	750,000	750,000
Unsecured term loan, net	$ 744,821	748,734
Interest rate, end of period (in percentage)	3.87%
Unsecured Revolving Credit Facilities
Debt Instrument
Revolving credit facilities	$ 80,000	$ 0
Interest rate, end of period (in percentage)	3.46%

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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