SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION - Carrying Amount and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Real Estate Properties
Balance at the beginning of the period	$ 3,522,143	$ 3,493,231	$ 3,944,636
Additions	584,805	122,116	66,221
Loss on asset impairment	(58,696)	(2,954)	(22,255)
Disposals	(72,137)	(31,193)	(424,302)
Cost basis adjustment	(37,239)	(3,968)	(9,169)
Reclassification of assets of properties held for sale	(27,790)	(55,089)	(61,900)
Balance at the end of the period	3,911,086	3,522,143	3,493,231
Accumulated Depreciation
Balance at the beginning of the period	451,914	387,656	375,147
Additions	92,266	83,828	89,398
Loss on asset impairment	0	0	0
Disposals	(8,675)	(13,125)	(64,167)
Cost basis adjustment	(37,239)	(3,968)	(9,169)
Reclassification of assets of properties held for sale	(2,354)	(2,477)	(3,553)
Balance at the end of the period	$ 495,912	$ 451,914	$ 387,656