IMPAIRMENT OF REAL ESTATE INVESTMENTS, ASSETS HELD FOR SALE, NET AND ASSET SALES - Company's Assets Held for Sale Activity (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) facility
Increase Decrease in Assets Held for Sale [Roll Forward]
Beginning balance, at cost	$ 1,821,902
Ending balance, at cost	1,812,680
Disposal Group, Held-for-sale, Not Discontinued Operations
Increase Decrease in Assets Held for Sale [Roll Forward]
Beginning balance, at cost	12,291
Additions to assets held for sale	10,374
Assets sold	(3,300)
Impairment of real estate held for sale	(1,886)
Ending balance, at cost	$ 17,479
Number of facilities at beginning | facility	5
Number of facilities, Additions to assets held for sale | facility	2
Number of facilities, Assets sold | facility	(1)
Number of facilities, Impairment of real estate held for sale | facility	0
Number of facilities at end | facility	6