The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Ownership interest in properties held by joint venture

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INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2018 USD ($) joint_venture	Jun. 30, 2019 USD ($) property	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) property	Jun. 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 \| $		$ 0.8	$ 2.3	$ 1.6	$ 4.0
Atria
Equity method investments
Ownership interests accounted for under the equity method		34.00%		34.00%
Eclipse Senior Living
Equity method investments
Ownership interests accounted for under the equity method		34.00%		34.00%
Ardent
Equity method investments
Ownership interests accounted for under the equity method		9.80%		9.80%
Real Estate Joint Ventures
Equity method investments
Ownership interests accounted for under the equity method		25.00%		25.00%		25.00%
Ownership interest in properties		90.00%		90.00%
Number of real estate properties \| property		6		6
Equity investments in an unconsolidated real estate venture with recognized impairment \| joint_venture	1