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Schedule III - Consolidated Real Estate and Accumulated Depreciation - Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investment in real estate:      
Balance, beginning of year $ 835,837 $ 829,143 $ 775,327
Addition: Land, buildings and improvements 26,444 49,669 86,117
Deduction: Properties sold (22,441) (42,975) (32,301)
Deduction: Impairment due to casualty loss (782)    
Balance, end of year 839,058 835,837 829,143
Accumulated depreciation:      
Balance, beginning of year 135,302 123,684 108,953
Addition: Depreciation 17,941 17,534 16,615
Deduction: Impairment due to casualty loss (352)    
Deduction: Accumulated depreciation related to properties sold (5,755) (5,916) (1,884)
Balance, end of year 147,136 $ 135,302 $ 123,684
Other disclosure      
Amount by which aggregate cost of the properties is higher for federal income tax purposes $ 19,599