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Schedule III - Real Estate Assets and Accumulated Depreciation (Details) - Schedule III - Reconciliation of Accumulated Depreciation - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]    
Balance at January 1 $ 222,557 $ 152,433
Depreciation expense 92,156 73,703
Accumulated depreciation of real estate dispositions (633) (3,579)
Balance at December 31 $ 314,080 $ 222,557