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v3.20.4

Acquisitions, Dispositions and Other Significant Transactions - Ventas Lease Portfolio Restructuring (Details) |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 26, 2018 USD ($) community extension_option | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) community lease | Dec. 31, 2019 USD ($) community | Dec. 31, 2018 USD ($) | Jul. 26, 2020 extension_option | Jan. 01, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of communities leased | lease |  |  | 235 |  |  |  |
Loss on facility lease termination and modification, net |  |  | $ (2,303,000) | $ 3,388,000 | $ 162,001,000 |  |
Ventas, Inc |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of extensions | extension_option |  |  |  |  |  | 2 |
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 extensions | extension_option | 2 |  |  |  |  |  |
Extension term |  |  | 10 years |  |  |  |
Rent expense |  |  |  |  | 175,000,000.0 |  |
Rent credit |  | $ 8,000,000.0 | $ 7,000,000.0 | $ 8,000,000.0 | $ 8,000,000.0 |  |
Base rent escalator, CPI increase |  |  |  |  |  |  | 2.25%
Base rent escalator, CPI increase multiplier |  |  |  |  |  |  | 4
Base rent escalator, CPI decrease |  |  |  |  |  |  | 0.00%
Investment minimum, unit per lease | $ 2,000 |  |  |  |  |  |
Period of lease | 24 months |  |  |  |  |  |
Investment in capital improvements | $ 30,000,000.0 |  |  |  |  |  |
Payment for change of control fees | $ 25,000,000.0 |  |  |  |  |  |
Number of communities exercised to market for sale and sold | community |  |  | 1 | 7 |  |  |
Reduction of rent for terminating communities |  |  | $ 100,000 | $ 1,700,000 |  |  |
Loss on facility lease termination and modification, net |  | $ (125,700,000) |  |  |  |  |

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