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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Real estate investments, at cost:      
Balance, beginning of year $ 1,809,615 $ 1,790,591 $ 1,790,590
Acquisitions 221,119 66,104  
Improvements 39,438 23,171 16,589
Assets held for sale (5,023)    
Dispositions (42,652) (70,251) (16,588)
Balance-Real Estate 2,022,497 1,809,615 1,790,591
Assets held for sale 5,023    
Balance, end of year 2,027,520 1,809,615 1,790,591
Accumulated depreciation:      
Balance, beginning of year 299,991 266,284 222,252
Depreciation 52,466 49,637 48,982
Assets held for sale (1,278)    
Dispositions (13,951) (15,930) (4,950)
Balance- Accumulated Depreciation 337,228 299,991 266,284
Assets held for sale 1,278    
Balance, end of year $ 338,506 $ 299,991 $ 266,284