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Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 12, 2023 | Jan. 01, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Scheduled to vest unvested shares |  |  |  |  |  |
Share-based compensation expense |  |  | $ 1,733 | $ 1,960 | $ 1,568 |
Distributions to shareholders |  |  | $ 9,568 | $ 9,540 | $ 42,825 |
Subsequent Event |  |  |  |  |  |
Scheduled to vest unvested shares |  |  |  |  |  |
Common distributions declared (in dollars per share) | $ 0.01 |  |  |  |  |
Distributions to shareholders | $ 2,397 |  |  |  |  |
AlerisLife Inc |  |  |  |  |  |
Scheduled to vest unvested shares |  |  |  |  |  |
Aggregate shares issued (shares) |  | 16,118,849 |  |  |  |
Certain our Officers and Employees of RMR |  |  |  |  |  |
Scheduled to vest unvested shares |  |  |  |  |  |
Shares purchased from certain of our officers and other employees of RMR LLC (in shares) |  |  | 133,752 | 109,384 | 47,375 |
AlerisLife Inc |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Aggregate market value of shares awarded |  | $ 59,801 |  |  |  |
Share Award Plans |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Remaining common shares available for issuance (in shares) |  |  | 2,667,253 |  |  |
Number of unvested shares (in shares) |  |  | 1,116,000 | 845,620 | 434,550 | 227,340
Scheduled to vest unvested shares |  |  |  |  |  |
2023 (in shares) |  |  | 374,800 |  |  |
2024 (in shares) |  |  | 329,400 |  |  |
2025 (in shares) |  |  | 270,400 |  |  |
2026 (in shares) |  |  | 141,400 |  |  |
Estimated future compensation for the unvested shares |  |  | $ 2,424 |  |  |
Weighted average period over which the compensation expense will be recorded |  |  | 1 year 10 months 24 days |  |  |
Officers and Employees | Share Award Plans | RMR |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Common shares awarded (in shares) |  |  | 707,000 | 718,000 | 360,000 |
Aggregate market value of shares awarded |  |  | $ 919 | $ 2,448 | $ 1,357 |
Award vesting period |  |  | 5 years |  |  |
Trustees | Share Award Plans | RMR |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Common shares awarded (in shares) |  |  | 20,000 | 20,000 | 10,000 |
Aggregate market value of shares awarded |  |  | $ 300 | $ 444 | $ 176 |
Market value of shares awarded to each Trustee |  |  | $ 43 | $ 74 | $ 29 |

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