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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Real estate investments, at cost:      
Balance, beginning of year $ 1,790,591 $ 1,790,590 $ 1,323,384
Acquisitions 66,104   454,445
Improvements 23,171 16,589 20,768
Dispositions (70,251) (16,588) (8,007)
Balance-Real Estate 1,809,615 1,790,591 1,790,590
Balance, end of year 1,809,615 1,790,591 1,790,590
Accumulated depreciation:      
Balance, beginning of year 266,284 222,252 180,756
Depreciation 49,637 48,982 41,763
Dispositions (15,930) (4,950) (267)
Balance- Accumulated Depreciation 299,991 266,284 222,252
Balance, end of year $ 299,991 $ 266,284 $ 222,252