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INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) board_member property	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) board_member property	Jun. 30, 2019 USD ($)	Dec. 31, 2019
Equity method investments
Number of real estate properties \| property	1,200		1,200
COVID-19 Impact
Equity method investments
Impairment on equity investment \| $			$ 10,700
Management Service
Equity method investments
Management fees \| $	$ 1,500	$ 800	$ 2,400	$ 1,600
the Fund [Member]
Equity method investments
Equity Method Investment, Ownership Percentage	21.00%		21.00%
Atria
Equity method investments
Equity Method Investment, Ownership Percentage	34.00%		34.00%
Number of board members appointed	2		2
Number of board members	6		6
Eclipse Senior Living
Equity method investments
Equity Method Investment, Ownership Percentage	34.00%		34.00%
Number of board members appointed	2		2
Number of board members	6		6
Remaining ownership percentage retained by investee	66.00%		66.00%
Ardent
Equity method investments
Equity Method Investment, Ownership Percentage	9.80%		9.80%
Number of board members appointed	1		1
Number of board members	11		11
Real Estate Joint Ventures
Equity method investments
Equity Method Investment, Ownership Percentage					25.00%
Unconsolidated Real Estate Entities
Equity method investments
Number of real estate properties \| property	8		8
Development Projects
Equity method investments
Number of real estate properties \| property	20		20
Development Projects \| Unconsolidated Real Estate Entities
Equity method investments
Number of real estate properties \| property	2		2