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Acquisitions, Dispositions and Other Significant Transactions - Blackstone Venture (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 29, 2017 USD ($) community | Apr. 30, 2018 community | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) community | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire joint venture |  |  |  |  |  |  |  |  |  |  | $ 9,124 | $ 199,017 | $ 13,377
Goodwill and asset impairment |  |  | $ 37,927 | $ 5,500 | $ 16,103 | $ 430,363 | $ 18,966 | $ 368,551 | $ 1,559 | $ 20,706 | 489,893 | 409,782 | 248,515
Change in valuation allowance |  |  |  |  |  |  |  |  |  |  | 329 | 71,782 |
Gain on sale of assets, net |  |  | $ 216,660 | $ 9,833 | $ 23,322 | 43,431 |  |  |  |  | $ 293,246 | $ 19,273 | $ 7,218
HCP, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities acquired | community |  | 5 |  |  |  |  |  |  |  |  |  |  |
Term of lease | 12 years |  |  |  |  |  |  |  |  |  |  |  |
Formation of the Blackstone Venture |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Change in valuation allowance |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage | 15.00% |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of investment | $ 66,800 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of investment | $ 47,100 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and asset impairment |  |  |  |  |  | $ 33,400 |  |  |  | $ 19,700 |  |  |
Equity interest sold |  |  |  | 15.00% |  |  |  |  |  |  |  |  |
Payment to complete sale of joint venture interest |  |  |  | $ 2,000 |  |  |  |  |  |  |  |  |
Gain on sale of assets, net |  |  |  | $ 3,800 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
2 Leased Communities Owned By Joint Venture Terminated | Blackstone Venture |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities disposed of | community |  |  |  | 2 |  |  |  |  |  |  |  |  |

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