Mortgage and Other Indebtedness (Operating Properties) (Details) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2015 USD ($) loan	Dec. 31, 2014
Schedule of principal repayments [Abstract]
2015	$ 265,988
2016	1,179,080
2017	477,484
2018	681,160
2019	119,667
Thereafter	2,096,937
Long-term debt	4,820,316
Net unamortized premiums	1,159
Mortgage and other indebtedness	$ 4,821,475
Weighted average maturity of mortgage and other indebtedness (in years)	4 years 1 month 7 days	4 years 9 months 18 days
Principal balance
Schedule of principal repayments [Abstract]
2015	$ 27,811
Number of debt instruments \| loan	1
Principal amortization
Schedule of principal repayments [Abstract]
2015	$ 16,947
Operating property loan
Schedule of principal repayments [Abstract]
2015	$ 221,230

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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