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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION - Summary (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Carrying cost      
Balance at beginning of period $ 1,301,563 $ 1,198,686 $ 949,838
Acquisitions 82,405 74,923 206,340
Improvements 25,800 49,134 33,463
Conversion of mortgage loans into owned properties     10,600
Capitalized interest 908 1,408 827
Other non-cash items (See Note 4)   2,460 2,882
Conveyed land (See Note 4)     (670)
Cost of real estate sold (18,554) (24,282) (2,344)
Impairment on real estate for sale   (766) (2,250)
Ending balance 1,392,122 1,301,563 1,198,686
Accumulated depreciation      
Balance at beginning of period 275,861 251,265 223,315
Depreciation expense 37,492 35,809 29,329
Cost of real estate sold (7,320) (11,213) (1,379)
Ending balance $ 306,033 $ 275,861 $ 251,265