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Schedule III - Real Estate and Accumulated Depreciation - Schedule of Real Estate and Accumulated Depreciation Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance $ 1,632,153 $ 851,639  
Property acquisitions 317,224 751,086  
Improvements 21,251 29,428  
Impairment (5,000) 0  
Reclassification 724 0  
Ending balance 1,966,352 1,632,153 $ 851,639
Amount of federal income tax basis over cost basis 36,400    
SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Beginning balance 60,173 19,386 4,417
Depreciation expense 53,751 40,787 14,969
Ending balance $ 113,924 $ 60,173 $ 19,386