SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION - Analysis of Carrying Amount of Real Estate Properties and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Real Estate Properties
Additions	$ 4,000	$ 6,300	$ 11,600
Balance at the end of the year	408,123
Accumulated Depreciation
Balance at the beginning of the year	156,439	143,319	202,700
Additions	15,072	15,054	15,275
Disposals	(1,981)	(1,934)	(74,656)
Balance at the end of the year	169,530	156,439	143,319
Aggregate cost of properties for federal income tax purposes	478,202
Real Estate Properties
Real Estate Properties
Balance at the beginning of the year	406,102	401,710	662,121
Additions	4,002	6,326	11,642
Disposals	(1,981)	(1,934)	(272,053)
Balance at the end of the year	$ 408,123	$ 406,102	$ 401,710
Buildings and improvements | Maximum
Accumulated Depreciation
Estimated useful lives	40 years
Personal property | Maximum
Accumulated Depreciation
Estimated useful lives	12 years