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Acquisitions, Dispositions and Other Significant Transactions - Ventas Lease Portfolio Restructuring (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 26, 2018 USD ($) community extension_option | Sep. 30, 2018 USD ($) community | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Apr. 26, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on facility lease termination and modification, net |  | $ 2,337,000 | $ 4,938,000 | $ 148,804,000 | $ 11,306,000 |  |  |  |  |
Ventas, Inc | Master Lease And Security Agreement |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of communities leased | community | 128 |  |  |  |  |  |  |  |  |
Prior number of communities | community | 107 |  |  |  |  |  |  |  |  |
Additional number of communities | community | 21 |  |  |  |  |  |  |  |  |
Number of communities added to agreement | community |  | 17 |  |  |  |  |  |  |  |
Number of extensions | extension_option | 2 |  |  |  |  |  |  |  |  |
Extension term | 10 years |  |  |  |  |  |  |  |  |
Investment minimum, unit per lease | $ 2,000 |  |  |  |  |  |  |  |  |
Period of lease | 24 months |  |  |  |  |  |  |  |  |
Investment in capital improvements | $ 30,000,000 |  |  |  |  |  |  |  |  |
Payment for change of control fees | $ 25,000,000 |  |  |  |  |  |  |  |  |
Management percent fee |  |  |  | 5.00% |  |  |  |  |  |
Loss on facility lease termination and modification, net |  |  |  | $ 125,700,000 |  |  |  |  |  |
Forecast | Ventas, Inc | Master Lease And Security Agreement |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Rent expense |  |  |  |  |  | $ 175,000,000 |  |  |  |
Rent credit |  |  |  |  |  | 8,000,000 | $ 5,000,000 | $ 7,000,000 | $ 8,000,000 |
Rent credit after change of control |  |  |  |  |  | $ 5,000,000 |  |  |  |
Base rent escalator, CPI increase |  |  |  |  |  | 2.25% |  |  |  |
Base rent escalator, CPI decrease |  |  |  |  |  | 0.00% |  |  |  |
Option to terminate, annual base rent |  |  |  |  |  |  |  |  |  | $ 30,000,000
Option to terminate, rent reduction percentage |  |  |  |  |  |  |  |  |  | 6.25%

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