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Schedule III - Consolidated Real Estate and Accumulated Depreciation - Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Investment in real estate:      
Balance, beginning of year $ 837,641 $ 839,058 $ 835,837
Addition: Land, buildings and improvements 59,654 28,837 26,444
Deduction: Properties sold (17,699) (28,064) (22,441)
Deduction: Property held-for-sale   (2,190)  
Deduction: Impairment due to casualty loss     (782)
Balance, end of year 879,596 837,641 839,058
Accumulated depreciation:      
Balance, beginning of year 160,664 147,136 135,302
Addition: Depreciation 18,471 17,694 17,941
Deduction: Impairment due to casualty loss     (352)
Deduction: Accumulated depreciation related to properties sold (5,992) (3,246) (5,755)
Deduction: Accumulated depreciation related to property held-for-sale   (920)  
Balance, end of year 173,143 $ 160,664 $ 147,136
Other disclosures      
Amount by which aggregate cost of the properties is higher for federal income tax purposes $ 22,018