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Schedule III - Consolidated Real Estate and Accumulated Depreciation (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investment in real estate:      
Balance, beginning of year $ 662,182 $ 592,668 $ 574,424
Addition: Land, buildings and improvements 121,564 83,643 57,584
Deduction: Properties sold/conveyed (35,681) (14,129) (38,247)
Deduction: Impairment loss     (1,093)
Balance, end of year 748,065 662,182 592,668
Accumulated depreciation:      
Balance, beginning of year 87,801 77,643 73,060
Addition: Depreciation 14,247 12,680 12,064
Deduction: Accumulated depreciation related to properties sold/conveyed (5,196) (2,522) (7,481)
Balance, end of year 96,852 $ 87,801 $ 77,643
Other disclosure      
Amount by which aggregate cost of the properties is higher for federal income tax purposes $ 10,850