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Fair Value Disclosures (Debt Obligations) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Estimated fair value of the Company's debt obligations compared to their carrying amounts    
Mortgages and secured loans payable $ 4,873,065 $ 4,885,863
Total debt obligations, net 4,873,065 4,885,863
Carrying Amount    
Estimated fair value of the Company's debt obligations compared to their carrying amounts    
Mortgages and secured loans payable 7,207 7,217
Notes payable 3,437,469 3,436,014
Unsecured credit facility and term loan 1,428,389 1,442,632
Total debt obligations, net 4,873,065 4,885,863
Fair Value    
Estimated fair value of the Company's debt obligations compared to their carrying amounts    
Mortgages and secured loans payable 7,172 7,072
Notes payable 3,462,929 3,372,418
Unsecured credit facility and term loan 1,436,953 1,452,382
Total debt obligations $ 4,907,054 $ 4,831,872