SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION - Changes in real estate investments and accumulated depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Real estate investments, at cost:
Balance, beginning of year	$ 1,526,665	$ 1,615,457	$ 2,140,733
Acquisitions	19,695
Improvements	29,194	60,132	60,910
Assets held for sale	(118,644)
Dispositions	(199,737)	(148,924)	(586,186)
Balance, end of year	1,257,173	1,526,665	1,615,457
Accumulated depreciation:
Balance, beginning of year	423,417	424,487	538,717
Depreciation	45,558	52,208	60,080
Assets held for sale	(35,399)
Dispositions	(67,227)	(53,278)	(174,310)
Balance, end of year	$ 366,349	$ 423,417	$ 424,487