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Acquisitions, Dispositions and Other Significant Transactions - Formation of Venture with Blackstone (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 29, 2017 USD ($) community | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire joint venture |  |  |  |  |  | $ 8,946 | $ 187,600
Goodwill and asset impairment |  | $ 5,500 |  | $ 368,551 |  | $ 451,966 | 390,816
Change in valuation allowance |  |  |  |  |  |  | 86,600
HCP, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Term of lease | 12 years |  |  |  |  |  |
Formation of the Blackstone Venture |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change in valuation allowance |  |  |  |  | $ 85,000 |  | $ 85,000
Joint Venture | Blackstone Venture |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of community leasehold interests contributed | community | 62 |  |  |  |  |  |
Payments to acquire joint venture | $ 179,200 |  |  |  |  |  |
Percentage ownership | 15.00% |  |  |  |  |  |
Carrying value of investment | $ 66,800 |  |  |  |  |  |
Fair value of investment | $ 47,100 |  |  |  |  |  |
Goodwill and asset impairment |  |  | $ 33,400 |  | $ 19,700 |  |
Joint Venture | Blackstone Venture | Senior Housing Communities |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of communities acquired | community | 64 |  |  |  |  |  |
Purchase price | $ 1,100,000 |  |  |  |  |  |
Number of communities managed by third party | community | 2 |  |  |  |  |  |
Blackstone Venture |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of communities leased | community | 2 |  |  |  |  |  |
Number of communities managed | community | 60 |  |  |  |  |  |

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