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Shareholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 15, 2021 USD ($) $ / shares | Jun. 03, 2021 trustee $ / shares shares | May 20, 2021 USD ($) | Feb. 18, 2021 USD ($) | Jun. 30, 2021 USD ($) shares | Jun. 30, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Number of trustees | trustee |  | 6 |  |  |  |
Distributions to shareholders | $ |  |  | $ 2,383 | $ 2,383 | $ 4,766 | $ 38,063
Subsequent Event |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Distributions to common shareholders declared (in dollars per share) | $ / shares | $ 0.01 |  |  |  |  |
Distributions to shareholders | $ | $ 2,384 |  |  |  |  |
Former Employees Of RMR LLC |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Number of shares (in shares) | shares |  |  |  |  | 13,906 |
Trustees |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Common shares awarded (in shares) | shares |  | 20,000 |  |  |  |
Common shares awarded, par value (in dollars per share) | $ / shares |  | $ 3.70 |  |  |  |

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