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Schedule III - Consolidated Real Estate and Accumulated Depreciation (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Investment in real estate:      
Balance, beginning of year $ 592,668 $ 574,424 $ 473,341
Addition: Land, buildings and improvements 83,643 57,584 101,145
Deduction: Properties sold/conveyed (14,129) (38,247)  
Deduction: Impairment loss   (1,093) (62)
Balance, end of year 662,182 592,668 574,424
Accumulated depreciation:      
Balance, beginning of year 77,643 73,060 62,816
Addition: Depreciation 12,680 12,064 10,244
Deduction: Accumulated depreciation related to properties sold/conveyed (2,522) (7,481)  
Balance, end of year 87,801 $ 77,643 $ 73,060
Other disclosure      
Amount by which aggregate cost of the properties is higher for federal income tax purposes $ 14,791