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)

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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))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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The number of real estate properties owned as of the balance sheet date.

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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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INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) property	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) property	Sep. 30, 2014 USD ($)	Dec. 31, 2014 property
Equity method investments
Number of real estate properties	1,300		1,300
Management fees earned \| $	$ 1.7	$ 2.0	$ 5.4	$ 6.2
ATRIA
Equity method investments
Ownership interests accounted for under the equity method (as a percent)	34.00%		34.00%		34.00%
Ardent
Equity method investments
Ownership interests accounted for under the equity method (as a percent)	9.90%		9.90%		9.90%
Unconsolidated Properties
Equity method investments
Number of real estate properties	51		51		51
Unconsolidated Properties \| Minimum
Equity method investments
Ownership interests accounted for under the equity method (as a percent)	5.00%		5.00%		5.00%
Unconsolidated Properties \| Maximum
Equity method investments
Ownership interests accounted for under the equity method (as a percent)	25.00%		25.00%		25.00%