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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The difference between the carrying value and the sale price of equity securities, not separately or otherwise categorized as trading or available-for-sale. This element includes investments in which the entity holds a small ownership stake (generally, less than 20% of the shares outstanding) and cannot exert significant influence.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(h))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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- Definition

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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- Definition

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))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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- Definition

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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No definition available.

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- Definition

Decrease in debt related to investment in unconsolidated entities

+ References

No definition available.

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- Definition

Equity investments in an unconsolidated real estate venture with recognized impairment

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No definition available.

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- Definition

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

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No definition available.

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- Definition

Potential management fee revenue lost due to sale of interest in joint venture

+ References

No definition available.

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INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details)	1 Months Ended		3 Months Ended		6 Months Ended
INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details)	Jul. 27, 2018 USD ($)	Mar. 31, 2018 USD ($) joint_venture	Jun. 30, 2018 USD ($) property	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) property	Jun. 30, 2017 USD ($)
Equity method investments
Management fees earned			$ 2,300,000	$ 1,400,000	$ 4,000,000.0	$ 3,000,000.0
Impairment loss on equity method investment in a real estate joint venture		$ 35,700,000
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			9.90%		9.90%
Real Estate Joint Ventures
Equity method investments
Ownership interests accounted for under the equity method			25.00%		25.00%
Number of real estate properties owned by joint ventures \| property			31		31
Equity investments in an unconsolidated real estate venture with recognized impairment \| joint_venture		1
Subsequent Event \| Real Estate Joint Ventures
Equity method investments
Ownership interests accounted for under the equity method	25.00%
Proceeds from sale of joint venture interest	$ 57,500,000
Decrease in debt related to investment in unconsolidated entities	23,300,000
Subsequent Event \| Scenario, Forecast \| Real Estate Joint Ventures
Equity method investments
Gain (loss) on sale of joint venture interest	0
Potential management fee revenue lost due to sale of interest in joint venture	$ 4,600,000