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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION - Changes in real estate investments and accumulated depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Real estate investments, at cost:      
Balance, beginning of year $ 2,027,520 $ 1,809,615 $ 1,790,591
Acquisitions   221,119 66,104
Improvements 54,097 39,438 23,171
Assets held for sale   (5,023)  
Dispositions (72,794) (42,652) (70,251)
Balance-Real Estate 2,008,823 2,022,497 1,809,615
Assets held for sale   5,023  
Balance, end of year 2,008,823 2,027,520 1,809,615
Accumulated depreciation:      
Balance, beginning of year 338,506 299,991 266,284
Depreciation 57,312 52,466 49,637
Assets held for sale   (1,278)  
Dispositions (19,687) (13,951) (15,930)
Balance- Accumulated Depreciation 376,131 337,228 299,991
Assets held for sale   1,278  
Balance, end of year $ 376,131 $ 338,506 $ 299,991