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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION - Change in Total Cost of Real Estate Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]            
Balance at the beginning of the year $ 1,320,273 $ 1,306,192 $ 1,105,504 $ 654,560 $ 423,729  
Acquisitions 133,660 0 187,032 444,233 222,273 $ 26,979
Dispositions during the year (33,053) 0 0 0 0 (951)
Capital expenditures and transfers from construction-in-progress 10,494 14,081 13,656 6,711 8,558 5,238
Investment in Real Estate $ 1,431,374 $ 1,320,273 $ 1,306,192 $ 1,105,504 $ 654,560 $ 423,729