In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)(2)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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- Definition

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

+ References

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

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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 businesses acquired by the entity during the period.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

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INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		1 Months Ended
	Jun. 30, 2014 property	Jun. 30, 2013	Jun. 30, 2014 property	Jun. 30, 2013	Mar. 31, 2013 Two Medical Office Buildings Acquired March 2013 property	Jun. 30, 2013 Two Medical Office Buildings Acquired March 2013	Jun. 30, 2014 ATRIA	Dec. 31, 2013 ATRIA	Jun. 30, 2014 Unconsolidated Properties property	Jun. 30, 2014 Unconsolidated Properties Minimum	Dec. 31, 2013 Unconsolidated Properties Minimum	Jun. 30, 2014 Unconsolidated Properties Maximum	Dec. 31, 2013 Unconsolidated Properties Maximum
Equity Method Investments and Joint Ventures [Abstract]
Management fees earned in connection with unconsolidated entities	$ 2.0	$ 1.4	$ 4.2	$ 2.9
Equity method investments
Ownership interests accounted for under the equity method (as a percent)						5.00%	34.00%	34.00%		5.00%	5.00%	25.00%	25.00%
Number of properties accounted for under equity method	1,500		1,500						50
Number of real estate properties					2
Purchase of joint venture interests					55.6
Gain on re-measurement of equity method investments					$ 1.3