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Investments in and Advances to Unconsolidated Joint Ventures - Schedule of Equity Method Investments (Details) $ in Thousands | Sep. 30, 2018 USD ($) joint_venture | Dec. 31, 2017 USD ($) | Mar. 31, 2017
--- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in and advances to unconsolidated joint ventures | $ 623,255 | $ 800,840 |
CCRC JV |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 49.00% |  |
Investments in and advances to unconsolidated joint ventures | $ 374,988 | 400,241 |
RIDEA II |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 40.00% |  | 40.00%
Investments in and advances to unconsolidated joint ventures | $ 0 | 259,651 |
UK JV |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 49.00% |  |
Investments in and advances to unconsolidated joint ventures | $ 105,200 | 0 |
Life Science JVs |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in and advances to unconsolidated joint ventures | $ 67,328 | 65,581 |
Life Science JVs | Minimum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 50.00% |  |
Life Science JVs | Maximum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 63.00% |  |
Torrey Pines Science Center, LP |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 50.00% |  |
Britannia Biotech Gateway, LP |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 55.00% |  |
LASDK, LP |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 63.00% |  |
MBK JV |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 50.00% |  |
Investments in and advances to unconsolidated joint ventures | $ 35,934 | 38,005 |
Development JVs |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in and advances to unconsolidated joint ventures | $ 26,100 | 23,365 |
Number of unconsolidated joint ventures | joint_venture | 4 |  |
Development JVs | Minimum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 50.00% |  |
Development JVs | Maximum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 90.00% |  |
Vintage Park Development JV |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 85.00% |  |
Waldwick |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 85.00% |  |
Otay Ranch |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 90.00% |  |
MBK Development JV |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 50.00% |  |
Medical Office JVs |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in and advances to unconsolidated joint ventures | $ 12,313 | 12,488 |
Number of unconsolidated joint ventures | joint_venture | 3 |  |
Medical Office JVs | Minimum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 20.00% |  |
Medical Office JVs | Maximum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 67.00% |  |
HCP Ventures IV, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 20.00% |  |
HCP Ventures III, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 30.00% |  |
Suburban Properties, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 67.00% |  |
K&Y JVs |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment ownership percentage | 80.00% |  |
Investments in and advances to unconsolidated joint ventures | $ 1,380 | 1,283 |
Number of unconsolidated joint ventures | joint_venture | 3 |  |
Advances to unconsolidated joint ventures, net |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in and advances to unconsolidated joint ventures | $ 12 | $ 226 |

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