INVESTMENT IN REAL ESTATE PROPERTIES - Summarized Financial Data of Unconsolidated Joint Venture (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Summarized financial information
Total revenues	$ 140,764	$ 128,591		$ 459,826	$ 433,888
Company's share of net income (loss)
Other-than-temporary impairment				0	164,126
Loss from unconsolidated joint venture	$ (4,384)	$ (4,018)		(9,715)	(178,817)
Enlivant Joint Venture
Company's share of net income (loss)
Company’s share of net loss				(3,525)	(6,739)
Basis adjustments				5,755	7,952
Other-than-temporary impairment			$ 164,100	0	164,126
Loss from unconsolidated joint venture				(9,280)	(178,817)
Enlivant Joint Venture
Summarized financial information
Total revenues				237,144	200,927
Operating expenses				215,293	182,777
Net loss				(7,177)	(14,036)
Company's share of net income (loss)
Funding payments, beyond contractual requirement				$ 12,000	$ 5,000