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Fair Value of Financial Instruments (Details) - USD ($)
Dec. 31, 2017
Oct. 02, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions      
Derivative assets $ 12,586,000   $ 5,935,000
Derivative liabilities 265,000   1,303,000
Unsecured Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions      
Notes payable 1,960,560,000   2,011,210,000
Unsecured Debt | Registered Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions      
Debt instrument, face amount   $ 400,000,000.0  
Discount net of amortization 722,000    
Unsecured Debt | Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions      
Notes payable 1,974,278,000   2,025,000,000
Secured Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions      
Notes payable 458,441,000   669,924,000
Secured Debt | Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions      
Notes payable 464,311,000   682,839,000
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 12,586,000   5,935,000
Derivative liabilities 265,000   1,303,000
Level 3      
Fair Value, Balance Sheet Grouping, Financial Statement Captions      
Derivative assets 0   0
Derivative liabilities $ 0   $ 0