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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Real estate investments, at cost:      
Balance, beginning of year $ 2,140,733 $ 2,127,907 $ 2,058,352
Improvements 60,910 75,472 74,324
Dispositions (586,186) (62,646) (4,769)
Balance, end of year 1,615,457 2,140,733 2,127,907
Accumulated depreciation:      
Balance, beginning of year 538,717 490,697 432,579
Depreciation 60,080 67,001 62,887
Dispositions (174,310) (18,981) (4,769)
Balance, end of year $ 424,487 $ 538,717 $ 490,697