Schedule III-Real Estate and Accumulated Depreciation - Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cost
Balance at beginning of year	$ 367,160	$ 354,586
Changes during the year:
Additions to real estate assets	177,000	23,226
Reclassification to real estate held for sale	(27,463)	(8,314)
Impairment loss	(3,000)	(2,085)
Writeoff of fully depreciated assets	(19,971)	(253)
Balance at end of year	493,726	367,160
Reserve
Balance at beginning of year	(124,839)	(115,642)
Changes during the year:
Additions to reserve charged to costs and expenses	(13,563)	(11,930)
Reclassification to real estate held for sale	18,871	2,480
Writeoff of fully depreciated assets	19,971	253
Balance at end of year	$ (99,560)	$ (124,839)