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Acquisitions, Dispositions and Other Significant Transactions - Community Transactions and Completed Dispositions of Owned Communities (Details) $ in Thousands | 12 Months Ended | 36 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) community | Dec. 31, 2020 USD ($) community | Dec. 31, 2019 USD ($) community | Dec. 31, 2021 USD ($) community | Jul. 26, 2020 community
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Assets held for sale | $ | $ 3,642 | $ 16,061 |  | $ 3,642 |
Gain (loss) on sale of assets, net | $ | $ 288,835 | $ 374,532 | $ 7,245 |  |
Ventas, Inc |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of owned communities transferred |  |  |  |  | 5
Communities Disposed of Through Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of communities disposed of |  |  |  | 24 |
Communities Disposed of Through Sale | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of communities disposed of | 3 | 2 | 14 |  |
Net cash proceeds | $ | $ 16,500 | $ 38,100 | $ 85,400 |  |
Gain (loss) on sale of assets, net | $ | $ 300 | $ 2,700 | $ 5,500 |  |
Communities Disposed of Through Lease Terminations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of communities disposed of | 2 | 5 | 10 | 17 |
41 Communities Disposed of Through Lease Terminations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of communities disposed of |  |  |  | 41 |
Communities Held For Sale | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of communities classified as held for sale | 2 |  |  |  |
Assets held for sale | $ | $ 3,600 |  |  | $ 3,600 |
Communities Acquired Previously Leased or Managed |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of communities acquired |  |  |  | 27 |

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