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Related Person Transactions (Details) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) agreement shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Feb. 28, 2023 $ / shares
Related Party Transaction |  |  |  |
Revenue | $ 1,283,566 | $ 1,383,212 | $ 1,632,026 |
Subsequent Event | AlerisLife Inc |  |  |  |
Related Party Transaction |  |  |  |
Investment in equity securities acquisition, share price (in dollars per share) | $ / shares |  |  |  | $ 1.31
Common stock proposed acquisition percentage |  |  |  | 31.90%
Rental income |  |  |  |
Related Party Transaction |  |  |  |
Revenue | $ 260,740 | 408,589 | 427,215 |
AlerisLife Inc |  |  |  |
Related Party Transaction |  |  |  |
Investment in common shares (in shares) | shares | 10,691,658 |  |  |
Ownership interest by parent | 31.90% |  |  |
Affiliated Entity |  |  |  |
Related Party Transaction |  |  |  |
Minimum percentage of ownership of lessee's voting stock above which the entity has the option to cancel all its rights | 9.80% |  |  |
Reit Management And Research |  |  |  |
Related Party Transaction |  |  |  |
Related party transaction, closing cost | $ 8,715 |  |  |
AlerisLife Inc |  |  |  |
Related Party Transaction |  |  |  |
Maximum percentage of any class of equity shares that can be acquired without approval | 9.80% |  |  |
RMR |  |  |  |
Related Party Transaction |  |  |  |
Number of management agreements with related party | agreement | 2 |  |  |
RMR | Rental income |  |  |  |
Related Party Transaction |  |  |  |
Revenue | $ 303 | $ 190 | $ 163 |
ABP Acquisition LLC | AlerisLife Inc |  |  |  |
Related Party Transaction |  |  |  |
Ownership interest by noncontrolling owners | 6.10% |  |  |
RMR | Year one |  |  |  |
Related Party Transaction |  |  |  |
Award vesting rights, percentage | 20.00% |  |  |
RMR | Year two |  |  |  |
Related Party Transaction |  |  |  |
Award vesting rights, percentage | 20.00% |  |  |
RMR | Year three |  |  |  |
Related Party Transaction |  |  |  |
Award vesting rights, percentage | 20.00% |  |  |
RMR | Year four |  |  |  |
Related Party Transaction |  |  |  |
Award vesting rights, percentage | 20.00% |  |  |
RMR | Year five |  |  |  |
Related Party Transaction |  |  |  |
Award vesting rights, percentage | 20.00% |  |  |

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