INVESTMENT IN REAL ESTATE PROPERTIES - Summarized Financial Information for Enlivant Joint Venture (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2022	Jun. 30, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Balance Sheet Amounts
Total assets	$ 5,747,672		$ 5,386,150	$ 5,747,672
Total liabilities	2,691,277		2,583,616	2,691,277
Income Statement Amounts
Total revenues			647,514	624,811	$ 569,545
Other-than-temporary impairment			0	57,778	164,126
Loss from unconsolidated joint venture			(2,897)	(98,032)	(192,081)
Enlivant Joint Venture
Income Statement Amounts
Company’s share of net loss			(2,897)	(32,581)	(17,184)
Basis adjustments			0	7,673	10,771
Other-than-temporary impairment	57,800	$ 164,100	0	57,778	164,126
Loss from unconsolidated joint venture			(2,897)	(98,032)	(192,081)
Enlivant Joint Venture
Balance Sheet Amounts
Total assets	754,220		353,779	754,220
Total liabilities	894,969		106,490	894,969
Member’s equity (deficit)	$ (140,749)		247,289	(140,749)
Income Statement Amounts
Total revenues			64,446	351,073	274,693
Operating expenses			47,811	324,462	265,194
Net loss			$ (9,823)	(66,171)	(35,276)
Funding payments beyond contractual requirements				$ 25,000	$ 20,000