Debt (Summary of Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument
Total, net	$ 9,281,280	$ 9,278,263
Unsecured debt - Carrying amount	845,932	845,577
Unsecured term loan, net	372,595	372,215
Revolving credit facilities	115,630	115,630
Unsecured Debt And Revolving Credit Facility	1,334,157	1,333,422
Mortgages
Debt Instrument
Mortgages payable, gross	9,369,839	9,374,297
Deferred financing costs, net and other	(88,559)	(96,034)
Total, net	$ 9,281,280	9,278,263
Interest Rate, End of Period (in percentage)	3.43%
Mortgages \| Fixed Rate
Debt Instrument
Mortgages payable, gross	$ 6,092,346	6,099,873
Interest Rate, End of Period (in percentage)	3.84%
Mortgages \| Variable Rate
Debt Instrument
Mortgages payable, gross	$ 3,277,493	3,274,424
Interest Rate, End of Period (in percentage)	2.68%
Senior Unsecured Notes
Debt Instrument
Deferred financing costs, net and other	$ (4,068)	(4,423)
Unsecured debt, gross	850,000	850,000
Unsecured debt - Carrying amount	$ 845,932	845,577
Interest Rate, End of Period (in percentage)	3.68%
Unsecured Term Loan
Debt Instrument
Deferred financing costs, net and other	$ (2,405)	(2,785)
Unsecured debt, gross	375,000	375,000
Unsecured term loan, net	$ 372,595	372,215
Interest Rate, End of Period (in percentage)	2.11%
Unsecured Revolving Credit Facilities
Debt Instrument
Revolving credit facilities	$ 115,630	$ 115,630
Interest Rate, End of Period (in percentage)	1.88%

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

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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

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Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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Notes And Loans Payable Gross

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