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Fair Value Disclosures (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Estimated fair value of the Company's debt obligations compared to their carrying amounts    
Mortgages and secured loans payable $ 6,007,397 $ 5,974,266
Total debt obligations 6,007,397 5,974,266
Carrying Amounts [Member]    
Estimated fair value of the Company's debt obligations compared to their carrying amounts    
Mortgages and secured loans payable 2,256,927 2,265,519
Notes payable 1,204,327 1,203,854
Unsecured credit facility and term loan 2,546,143 2,504,893
Total debt obligations 6,007,397 5,974,266
Fair Value [Member]    
Estimated fair value of the Company's debt obligations compared to their carrying amounts    
Mortgages and secured loans payable 2,363,560 2,367,070
Notes payable 1,160,258 1,198,504
Unsecured credit facility and term loan 2,556,000 2,516,000
Total debt obligations $ 6,079,818 $ 6,081,574