INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details) $ in Millions	3 Months Ended
Mar. 31, 2018 USD ($) property joint_venture	Mar. 31, 2017 USD ($)
Equity method investments
Management fees earned	$ 1.7	$ 1.6
Impairment loss on equity method investment in a real estate joint venture	$ 35.7
Atria
Equity method investments
Ownership interests accounted for under the equity method	34.00%
Eclipse Senior Living
Equity method investments
Ownership interests accounted for under the equity method	34.00%
Ardent
Equity method investments
Ownership interests accounted for under the equity method	9.90%
Real Estate Joint Ventures
Equity method investments
Ownership interests accounted for under the equity method	25.00%
Number of real estate properties owned by joint ventures \| property	31
Equity investments in an unconsolidated real estate venture with recognized impairment \| joint_venture	1

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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Impairment losses measured as the amount by which the carrying amount of the business or real estate partnerships exceeds the fair value of the business or partnership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Equity investments in an unconsolidated real estate venture with recognized impairment

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The number of properties that are accounted for under the equity method of accounting.

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