IMPAIRMENT OF REAL ESTATE AND DISPOSITIONS - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) facility	Dec. 31, 2020 USD ($) facility	Dec. 31, 2019 USD ($) facility
Impairment of real estate:
Impairment of real estate | $	$ 9,499	$ 4,003	$ 121,819
Closed | Facilities
Impairment of real estate:
Impairment of real estate | $	$ 9,000
Number of facilities | facility	1
Sold | Facilities
Impairment of real estate:
Impairment of real estate | $	$ 500		$ 26,600
Number of facilities | facility	2	4	10
Sold | Senior Care Centers facilities
Impairment of real estate:
Impairment of real estate | $			$ 95,200
Number of facilities | facility			30
Transitioned | Senior Care Centers facilities
Impairment of real estate:
Number of facilities | facility			1