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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION - Changes in real estate investments and accumulated depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Real estate investments, at cost:      
Balance, beginning of year $ 1,615,457 $ 2,140,733 $ 2,127,907
Improvements 60,132 60,910 75,472
Dispositions (148,924) (586,186) (62,646)
Balance, end of year 1,526,665 1,615,457 2,140,733
Accumulated depreciation:      
Balance, beginning of year 424,487 538,717 490,697
Depreciation 52,208 60,080 67,001
Dispositions (53,278) (174,310) (18,981)
Balance, end of year $ 423,417 $ 424,487 $ 538,717