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Acquisitions, Dispositions and Other Significant Transactions - 2016 HCP Agreements (Details) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 29, 2017 community | Nov. 01, 2016 community | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2016 community | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) community | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Gain on sale of assets, net | $ |  |  | $ 216,660 | $ 9,833 | $ 23,322 | $ 43,431 |  | $ 293,246 | $ 19,273 | $ 7,218
Termination Of Triple Net Leases |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of communities disposed of |  | 97 |  |  |  |  |  |  |  |
Termination Of Triple Net Leases, 33 Communities |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of communities disposed of |  | 33 |  |  |  |  |  |  |  |
Termination of 8 triple net leases |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of communities disposed of |  | 8 |  |  |  |  |  |  |  |
Ownership Percentage |  | 10.00% |  |  |  |  |  |  |  |
Termination Of 7 Triple Net Leases |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of communities disposed of |  |  |  |  |  |  | 7 |  |  |
Termination Of 25 Triple Net Leases |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of communities disposed of |  | 25 |  |  |  |  |  |  |  |
Sale Of 21 Communities |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of communities disposed of |  |  |  |  |  |  |  |  | 21 |
Financing leases | $ |  |  |  |  |  |  |  |  | $ 145,300 |
Finance lease obligations | $ |  |  |  |  |  |  |  |  | 156,700 |
Gain on sale of assets, net | $ |  |  |  |  |  |  |  |  | $ 11,400 |
HCP, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number communities contributed to joint venture |  | 4 |  |  |  |  |  |  |  |
Joint Venture | Blackstone Venture | Senior Housing Communities |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of communities acquired | 64 |  |  |  |  |  |  |  |  |

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