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INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2018 USD ($) joint_venture	Sep. 30, 2019 USD ($) property board_member	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) property board_member	Sep. 30, 2018 USD ($)	Jul. 31, 2018
Equity method investments
Number of real estate properties \| property		1,200		1,200
Impairment loss on equity method investment in a real estate joint venture \| $	$ 35.7
Management Service
Equity method investments
Management fees \| $		$ 0.9	$ 1.1	$ 2.5	$ 5.1
Atria
Equity method investments
Ownership interests accounted for under the equity method		34.00%		34.00%
Number of board members appointed		2		2
Number of board members		6		6
Eclipse Senior Living
Equity method investments
Ownership interests accounted for under the equity method		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
Ownership interests accounted for under the equity method		9.80%		9.80%
Number of board members appointed		1		1
Number of board members		11		11
Real Estate Joint Ventures
Equity method investments
Ownership interests accounted for under the equity method		25.00%		25.00%		25.00%
Number of real estate properties \| property		6		6
Equity investments in an unconsolidated real estate venture with recognized impairment \| joint_venture	1