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Schedule III - Consolidated Real Estate and Accumulated Depreciation (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investment in real estate:      
Balance, beginning of year $ 748,065 $ 662,182 $ 592,668
Addition: Land, buildings and improvements 47,207 121,564 83,643
Deduction: Properties sold/conveyed (19,792) (35,681) (14,129)
Deduction: Impairment loss (153)    
Balance, end of year 775,327 748,065 662,182
Accumulated depreciation:      
Balance, beginning of year 96,852 87,801 77,643
Addition: Depreciation 15,689 14,247 12,680
Deduction: Accumulated depreciation related to properties sold/conveyed (3,588) (5,196) (2,522)
Balance, end of year 108,953 $ 96,852 $ 87,801
Other disclosure      
Amount by which aggregate cost of the properties is higher for federal income tax purposes $ 13,260