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Schedule III - Real Estate and Accumulated Depreciation (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in accumulated depreciation      
Balance, beginning of period $ (666,710) $ (416,044) $ (206,262)
Depreciation (281,747) (260,154) (223,731)
Dispositions 1,960 3,566 318
Write-offs 6,773 5,922 13,631
Balance, end of period $ (939,724) $ (666,710) $ (416,044)
Building and Building Improvements | Minimum      
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]      
Estimated useful life of asset 3 years    
Building and Building Improvements | Maximum      
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]      
Estimated useful life of asset 30 years