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Schedule III - Consolidated Real Estate and Accumulated Depreciation - Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investment in real estate:      
Balance, beginning of year $ 829,143 $ 775,327 $ 748,065
Addition: Land, buildings and improvements 49,669 86,117 47,207
Deduction: Properties sold (42,975) (32,301) (19,792)
Deduction: Impairment loss     (153)
Balance, end of year 835,837 829,143 775,327
Accumulated depreciation:      
Balance, beginning of year 123,684 108,953 96,852
Addition: Depreciation 17,534 16,615 15,689
Deduction: Accumulated depreciation related to properties sold (5,916) (1,884) (3,588)
Balance, end of year 135,302 $ 123,684 $ 108,953
Other disclosure      
Amount by which aggregate cost of the properties is higher for federal income tax purposes $ 16,861