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INVESTMENT IN UNCONSOLIDATED ENTITIES - Narrative (Details) $ in Thousands	1 Months Ended		3 Months Ended	12 Months Ended
	Dec. 31, 2022 USD ($) board_member	Jun. 30, 2020 USD ($)	Dec. 31, 2022 USD ($) board_member	Dec. 31, 2022 USD ($) board_member	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Equity method investments
Income recognized				$ 28,500	$ 4,973	$ 1,832
COVID-19 Impact
Equity method investments
Impairment recognized		$ 10,700				10,700
Atria
Equity method investments
Ownership interests	34.00%		34.00%	34.00%
Number of board of directors members appointed \| board_member	2		2	2
Non-cash gain on sale			$ 26,100
Income recognized	$ 11,700
Ardent
Equity method investments
Ownership interests	9.80%		9.80%	9.80%
Number of board of directors members appointed \| board_member	1		1	1
Glennis Combined SaaS Company
Equity method investments
Ownership interests	10.00%		10.00%	10.00%
Ventas Fund
Equity method investments
Revenue from contracts with customers				$ 9,900
Management Service
Equity method investments
Revenue from contracts with customers				$ 14,500	$ 12,400	$ 6,700