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=6382943&loc=d3e33918-111571

+ Details

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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=26872669&loc=d3e20235-122688

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- Definition

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

+ References

No definition available.

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INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 property	Mar. 31, 2014	Dec. 31, 2014
Equity method investments
Number of properties accounted for under equity method	1,600us-gaap_NumberOfRealEstateProperties
Management fees earned in connection with unconsolidated entities	$ 1.9us-gaap_ManagementFeesRevenue	$ 2.2us-gaap_ManagementFeesRevenue
ATRIA
Equity method investments
Ownership interests accounted for under the equity method (as a percent)	34.00%		34.00%
Unconsolidated Properties
Equity method investments
Number of properties accounted for under equity method	51		51
Unconsolidated Properties \| Minimum
Equity method investments
Ownership interests accounted for under the equity method (as a percent)	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%