IMPAIRMENT OF REAL ESTATE INVESTMENTS, ASSETS HELD FOR SALE, NET AND ASSET SALES - Schedule of Company's Assets Held for Sale Activity (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) facility	Mar. 31, 2023 USD ($) facility
Increase Decrease in Assets Held for Sale [Roll Forward]
Beginning balance, at cost	$ 2,005,077
Ending balance, at cost	2,070,839
Disposal Group, Held-for-sale, Not Discontinued Operations
Increase Decrease in Assets Held for Sale [Roll Forward]
Beginning balance, at cost	15,011	$ 12,291
Additions to assets held for sale	1,251	10,374
Assets sold	(1,035)	(3,300)
Impairment of real estate held for sale	(2,744)	(1,886)
Ending balance, at cost	$ 12,483	$ 17,479
Number of facilities at beginning | facility	14	5
Number of facilities, Additions to assets held for sale | facility	1	2
Number of facilities, Assets sold | facility	(2)	(1)
Number of facilities, Impairment of real estate held for sale | facility	0	0
Number of facilities at end | facility	13	6