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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Real estate investments, at cost:      
Balance, beginning of year $ 2,008,823 $ 2,027,520 $ 1,809,615
Acquisitions     221,119
Improvements 53,279 54,097 39,438
Assets held for sale     (5,023)
Dispositions (3,750) (72,794) (42,652)
Balance-Real Estate 2,058,352 2,008,823 2,022,497
Assets held for sale     5,023
Balance, end of year 2,058,352 2,008,823 2,027,520
Accumulated depreciation:      
Balance, beginning of year 376,131 338,506 299,991
Depreciation 60,198 57,312 52,466
Assets held for sale     (1,278)
Dispositions (3,750) (19,687) (13,951)
Balance- Accumulated Depreciation 432,579 376,131 337,228
Assets held for sale     1,278
Balance, end of year $ 432,579 $ 376,131 $ 338,506