Debt (Summary of Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument
Deferred financing costs, net and other	$ (34,462)	$ (38,407)
Unsecured term loan, net	796,762	745,840
Revolving credit facilities	575,000	575,000
Long-term debt	1,818,447	1,766,712
Collateral property, net carrying value	5,500,000
Mortgages
Debt Instrument
Mortgages payable, gross	5,608,458	5,670,016
Deferred financing costs, net and other	(27,909)	(30,119)
Total, net	$ 5,580,549	5,639,897
Interest rate, end of period (in percentage)	2.91%
Mortgages \| Fixed Rate
Debt Instrument
Mortgages payable, gross	$ 3,012,643	4,601,516
Interest rate, end of period (in percentage)	3.68%
Mortgages \| Variable Rate
Debt Instrument
Mortgages payable, gross	$ 2,595,815	1,068,500
Interest rate, end of period (in percentage)	2.02%
Senior unsecured notes
Debt Instrument
Deferred financing costs, net and other	$ (3,315)	(4,128)
Unsecured debt, gross	450,000	450,000
Unsecured term loan, net	$ 446,685	445,872
Interest rate, end of period (in percentage)	3.50%
Unsecured term loan
Debt Instrument
Deferred financing costs, net and other	$ (3,238)	(4,160)
Unsecured debt, gross	800,000	750,000
Unsecured term loan, net	$ 796,762	745,840
Interest rate, end of period (in percentage)	3.70%
Unsecured revolving credit facilities
Debt Instrument
Revolving credit facilities	$ 575,000	$ 575,000
Interest rate, end of period (in percentage)	1.05%

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

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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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