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, 2023	Dec. 31, 2022	Dec. 31, 2021
Real Estate Properties
Additions	$ 7,600	$ 4,000	$ 6,300
Balance at the end of the year	411,887
Accumulated Depreciation
Balance at the beginning of the year	169,530	156,439	143,319
Additions	14,879	15,072	15,054
Disposals	(3,874)	(1,981)	(1,934)
Balance at the end of the year	180,535	169,530	156,439
Aggregate cost of properties for federal income tax purposes	545,860
Real Estate Properties
Real Estate Properties
Balance at the beginning of the year	408,123	406,102	401,710
Additions	7,638	4,002	6,326
Disposals	(3,874)	(1,981)	(1,934)
Balance at the end of the year	$ 411,887	$ 408,123	$ 406,102
Buildings and improvements | Maximum
Accumulated Depreciation
Estimated useful lives	40 years
Personal property | Maximum
Accumulated Depreciation
Estimated useful lives	12 years