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Acquisitions, Dispositions and Other Significant Transactions - 2016 HCP Agreements (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 01, 2016 community | Jan. 31, 2017 community | Dec. 31, 2017 USD ($) community | Dec. 31, 2017 USD ($) community | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Mar. 29, 2017 community
Business Acquisition [Line Items] |  |  |  |  |  |  |
Gain on sale of assets, net | $ |  |  |  | $ 19,273 | $ 7,218 | $ 1,270 |
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 | 1 |  |  |  |  |
Ownership Percentage | 10.00% |  |  |  |  |  |
Termination Of 25 Triple Net Leases |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of communities disposed of | 25 |  |  | 25 |  |  |
Sale Of 21 Communities |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of communities disposed of |  |  |  | 21 |  |  |
Gain on sale of assets, net | $ |  |  |  | $ 11,400 |  |  |
Assets under financing leases, amount derecognized | $ |  |  | $ 145,300 | 145,300 |  |  |
Financing lease obligations, amount derecognized | $ |  |  | $ 156,700 | $ 156,700 |  |  |
HCP, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of communities contributed to joint venture | 4 |  |  |  |  |  |
Joint Venture | Blackstone Venture | Senior Housing Communities |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of communities acquired |  |  |  |  |  |  | 64
CCRCs-Rental |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of communities disposed of |  |  | 7 |  |  |  |
CCRCs-Rental | Termination Of 8 Triple Net Leases |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of communities disposed of |  |  |  | 1 |  |  |
Assisted Living | Termination Of 8 Triple Net Leases |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of communities disposed of |  |  |  | 6 |  |  |
Retirement Centers | Termination Of 8 Triple Net Leases |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of communities disposed of |  |  |  | 1 |  |  |

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