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Investments in and Advances to Unconsolidated Joint Ventures - Equity Method Investments (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) item | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Mar. 30, 2015
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Investments in and advances to unconsolidated joint ventures |  | $ 592,097 |  | $ 605,244 |  |
Other than temporary impairment charge | $ 27,234 |  | $ 27,234 |  |  |
CCRC JV | SHOP |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Number of unconsolidated joint ventures | item |  | 2 |  |  |  |
CCRC JV | SHOP |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Investments in and advances to unconsolidated joint ventures |  | $ 450,188 |  |  |  |
Investment ownership percentage |  | 49.00% |  |  |  |
HCRMC |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Other than temporary impairment charge |  |  | $ 27,000 | $ 19,000 | $ 36,000 |
HCRMC | QCP |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Investment ownership percentage |  | 9.00% |  |  |  |
MBK JV and MBK Development JV | SHOP |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Number of unconsolidated joint ventures | item |  | 2 |  |  |  |
MBK JV | SHOP |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Investments in and advances to unconsolidated joint ventures |  | $ 39,876 |  |  |  |
Investment ownership percentage |  | 50.00% |  |  |  |
MBK JV | Senior housing |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Investment ownership percentage |  |  |  |  |  | 50.00%
MBK Development JV | SHOP |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Investments in and advances to unconsolidated joint ventures |  | $ 2,464 |  |  |  |
Investment ownership percentage |  | 50.00% |  |  |  |
HCP Ventures III, LLC | Medical office |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Investments in and advances to unconsolidated joint ventures |  | $ 9,492 |  |  |  |
Investment ownership percentage |  | 30.00% |  |  |  |
HCP Ventures IV | Medical office |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Investments in and advances to unconsolidated joint ventures |  | $ 7,220 |  |  |  |
Investment ownership percentage |  | 20.00% |  |  |  |
HCP Life Science | Life science |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Investments in and advances to unconsolidated joint ventures |  | $ 68,251 |  |  |  |
HCP Life Science | Life science | Minimum |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Investment ownership percentage |  | 50.00% |  |  |  |
HCP Life Science | Life science | Maximum |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Investment ownership percentage |  | 63.00% |  |  |  |
Torrey Pines Science Center, LP | Life science |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Investment ownership percentage |  | 50.00% |  |  |  |
Britannia Biotech Gateway, LP | Life science |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Investment ownership percentage |  | 55.00% |  |  |  |
LASDK, LP | Life science |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Investment ownership percentage |  | 63.00% |  |  |  |
Vintage Park Development JV | SHOP |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Investments in and advances to unconsolidated joint ventures |  | $ 8,088 |  |  |  |
Investment ownership percentage |  | 85.00% |  |  |  |
Suburban Properties, LLC | Medical office |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Investments in and advances to unconsolidated joint ventures |  | $ 4,667 |  |  |  |
Investment ownership percentage |  | 67.00% |  |  |  |
K&Y | Other |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Investments in and advances to unconsolidated joint ventures |  | $ 1,324 |  |  |  |
Investment ownership percentage |  | 80.00% |  |  |  |
Advances to unconsolidated joint ventures, net |  |  |  |  |  |
Company owned interests in entities, accounted under equity method: |  |  |  |  |  |
Investments in and advances to unconsolidated joint ventures |  | $ 527 |  |  |  |

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=49116238&loc=d3e32787-111569 + Details
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