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Supplemental Disclosure of Cash Flow Information - Narrative (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 21 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2021 USD ($) | Oct. 31, 2021 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) community | Sep. 30, 2021 USD ($) community | Sep. 30, 2022 USD ($) community | Dec. 31, 2021 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of communities acquired | community |  |  |  |  |  |  | 1 |
Gain (loss) on sale of assets, net |  |  | $ (56) | $ 288,375 | $ 611 | $ 289,408 |  |
Investment in unconsolidated ventures |  |  | $ 57,701 |  | $ 57,701 |  | $ 57,701 | $ 67,424
Securities Purchase Agreement | HCA Healthcare, Inc. | Health Care Services |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Net cash proceeds | $ 305,800 |  |  |  |  |  |  |
Sale of stock, percentage of ownership sold in transaction (as a percent) | 80.00% |  |  |  |  |  |  |
Purchase price | $ 400,000 |  |  |  |  |  |  |
Net cash proceeds | 312,600 |  |  |  |  |  |  |
Proceeds from post closing working capital adjustment |  | $ 6,800 |  |  |  |  |  |
Investment in unconsolidated ventures | $ 100,000 |  |  |  |  |  |  |
Sale of stock, percentage of ownership after transaction (as a percent) | 20.00% |  |  |  |  |  |  |
Disposal Group, 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 | community |  |  |  |  | 2 | 2 | 5 |
Net cash proceeds |  |  |  |  | $ 4,400 | $ 8,500 |  |
Gain (loss) on sale of assets, net |  |  |  |  | $ 700 | $ 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 | community |  |  |  |  |  |  | 6 |

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