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Acquisitions, Dispositions and Other Significant Transactions - CCRC Venture (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) community | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Distributions from unconsolidated ventures from cumulative share of net earnings | $ 6,191 | $ 766 | $ 3,472
Equity in earnings (loss) of unconsolidated ventures | 10,394 | (2,107) | (4,544)
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Communities Disposed of Through Sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Cash proceeds | $ 16,500 | $ 38,100 | $ 85,400
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Communities Disposed of Through Sale | CCRC Venture |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of entry fee communities sold | community | 2 |  |
Cash proceeds | $ 14,000 |  |
Distributions from unconsolidated ventures from cumulative share of net earnings | 8,300 |  |
Equity in earnings (loss) of unconsolidated ventures | $ 13,600 |  |

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