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Acquisitions, Dispositions and Other Significant Transactions - Ventas Lease Portfolio Restructuring (Details) |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 26, 2018 USD ($) extension_option community | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) community | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Apr. 26, 2019 USD ($) | Jan. 01, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on facility lease termination and modification, net |  | $ 13,197,000 | $ 2,337,000 | $ 146,467,000 | $ 0 | $ 162,001,000 | $ 14,276,000 | $ 11,113,000 |  |  |  |  |
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 communities to be added to agreement | community |  |  |  |  |  | 4 |  |  |  |  |  |  |
Number of extensions | extension_option | 2 |  |  |  |  |  |  |  |  |  |  |  |
Extension term | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Rent expense |  |  |  |  |  | $ 175,000,000 |  |  |  |  |  |  |
Rent credit |  | 8,000,000 |  |  |  | 8,000,000 |  |  |  |  |  |  |
Rent credit after change of control |  | $ 5,000,000 |  |  |  | $ 5,000,000 |  |  |  |  |  |  |
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 credit |  |  |  |  |  |  |  |  | $ 5,000,000 | $ 7,000,000 | $ 8,000,000 |  |
Option to terminate, annual base rent |  |  |  |  |  |  |  |  |  |  |  | $ 30,000,000 |
Option to terminate, rent reduction percentage |  |  |  |  |  |  |  |  |  |  |  | 6.25% |
Subsequent event | Ventas, Inc | Master Lease And Security Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Base rent escalator, CPI increase |  |  |  |  |  |  |  |  |  |  |  |  | 2.25%
Base rent escalator, CPI increase multiplier |  |  |  |  |  |  |  |  |  |  |  |  | 4
Base rent escalator, CPI decrease |  |  |  |  |  |  |  |  |  |  |  |  | 0.00%

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