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Fair Value of Financial Instruments - Fair Value, Recurring and Nonrecurring (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Derivative assets $ 25,485,000 $ 12,586,000
Derivative liabilities 0 265,000
Non-real estate investment 2,713,000 0
Unsecured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Notes payable 1,968,163,000 1,960,560,000
Unsecured Debt | Registered Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Face amount 400,000,000.0  
Amortization of discount 685,000 722,000
Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Notes payable 357,092,000 458,441,000
Carrying Value | Unsecured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Notes payable 2,014,315,000 1,974,278,000
Carrying Value | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Notes payable 365,652,000 464,311,000
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Derivative assets 0 0
Derivative liabilities 0 0
Non-real estate investment 0 0
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Derivative assets 25,485,000 12,586,000
Derivative liabilities 0 265,000
Non-real estate investment 2,713,000 0
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Derivative assets 0 0
Derivative liabilities 0 0
Non-real estate investment $ 0 $ 0