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Fair Value of Financial Instruments - Fair Value, Recurring and Nonrecurring (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Derivative assets $ 6,250 $ 5,935
Derivative liabilities 819 1,303
Unsecured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Notes payable 1,962,238 2,011,210
Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Notes payable 669,181 669,924
Carrying Value | Unsecured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Notes payable 1,975,000 2,025,000
Carrying Value | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Notes payable 680,946 682,839
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 6,250 5,935
Derivative liabilities 819 1,303
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Derivative assets 0 0
Derivative liabilities $ 0 $ 0