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Schedule III - Real Estate and Accumulated Depreciation (Details) - Reconciliation of Accumulated Depreciation - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]      
Balance $ 260,115 $ 193,021 $ 134,311
Depreciation expenses 81,107 72,725 63,872
Properties sold during the year 3,551 0 0
Property assets fully depreciated and written off (8,464) (5,631) (5,162)
Balance $ 329,207 $ 260,115 $ 193,021