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Fair Value of Financial Instruments - Fair Value, Recurring and Nonrecurring (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Derivative assets $ 8,558 $ 5,935
Derivative liabilities 967 1,303
Notes payable 2,381,057 2,681,134
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Notes payable 2,407,196 2,707,839
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Derivative assets 0 0
Derivative liabilities 0 0
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Derivative assets 8,558 5,935
Derivative liabilities 967 1,303
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Derivative assets 0 0
Derivative liabilities $ 0 $ 0