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INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 1 Months Ended |  |  |  |  |  |  |  |  |
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Mar. 31, 2013 Two Medical Office Buildings Acquired March 2013 property | Feb. 28, 2013 Two Medical Office Buildings Acquired March 2013 | Jun. 30, 2013 Unconsolidated Properties property | Dec. 31, 2012 Unconsolidated Properties property | Jun. 30, 2013 Unconsolidated Properties Minimum | Dec. 31, 2012 Unconsolidated Properties Minimum | Jun. 30, 2013 Unconsolidated Properties Maximum | Dec. 31, 2012 Unconsolidated Properties Maximum | Jun. 30, 2013 ATRIA | Dec. 31, 2012 ATRIA
Equity Method Investments and Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fees earned in connection with unconsolidated entities | $ 1.1 | $ 1.9 | $ 2.6 | $ 3.7 |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interests accounted for under the equity method (as a percent) |  |  |  |  |  |  |  |  | 5.00% | 5.00% | 25.00% | 25.00% | 34.00% | 34.00%
Number of properties accounted for under equity method |  |  |  |  |  |  | 53 | 55 |  |  |  |  |  |
Ownership interests in properties accounted for under the equity method (as a percent) |  |  |  |  | 95.00% |  |  |  |  |  |  |  |  |
Number of real estate properties |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Purchase of joint venture interests |  |  |  |  | 55.2 |  |  |  |  |  |  |  |  |
Investment in joint ventures |  |  |  |  |  | 0.2 |  |  |  |  |  |  |  |
Fair value of previously held equity interest |  |  |  |  |  | 1.5 |  |  |  |  |  |  |  |
Gain on re-measurement of equity method investments |  |  |  |  | $ 1.3 |  |  |  |  |  |  |  |  |

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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 Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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=6880815&loc=d3e20235-122688 + Details
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