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Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 21, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 18, 2019 | Dec. 31, 2015
Scheduled to vest unvested shares |  |  |  |  |  |  |
Share-based compensation expense |  |  | $ 2,224 | $ 2,155 | $ 2,195 |  |
Distribution to common shareholders (in dollars per share) |  |  | $ 1.56 | $ 1.56 | $ 1.56 |  |
Common stock dividends, ordinary income distribution percentage |  |  | 38.13% | 88.44% | 58.77% |  |
Common stock dividends, capital distribution percentage |  |  | 0.00% | 0.00% | 40.67% |  |
Common stock dividends, qualified distribution percentage |  |  | 1.16% | 0.71% | 0.56% |  |
Common stock dividends, capital gain distribution percentage |  |  | 61.87% | 10.85% | 0.00% |  |
Certain Our Officers And Employees Of RMR LLC |  |  |  |  |  |  |
Scheduled to vest unvested shares |  |  |  |  |  |  |
Shares purchased from certain of our officers and other employees of RMR LLC (in shares) |  |  | 22,999 | 17,170 | 19,230 |  |
Share Award Plans |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Remaining common shares available for issuance (in shares) |  |  | 2,382,195 |  |  |  |
Number of unvested shares (in shares) |  |  | 161,990 | 148,010 | 153,410 |  | 158,874
Scheduled to vest unvested shares |  |  |  |  |  |  |
2019 (in shares) |  |  | 69,490 |  |  |  |
2020 (in shares) |  |  | 42,110 |  |  |  |
2021 (in shares) |  |  | 31,330 |  |  |  |
2022 (in shares) |  |  | 19,060 |  |  |  |
Estimated future compensation for the unvested shares |  |  | $ 2,267 |  |  |  |
Weighted average period over which the compensation expense will be recorded |  |  | 2 years |  |  |  |
Share Award Plans | Trustees |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common shares awarded (in shares) |  | 3,000 |  |  |  |  |
Aggregate market value of shares awarded |  | $ 47 |  |  |  |  |
Share Award Plans | RMR LLC | Officers and Employees |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common shares awarded (in shares) |  |  | 105,800 | 88,100 | 79,650 |  |
Aggregate market value of shares awarded |  |  | $ 2,022 | $ 1,743 | $ 1,724 |  |
Award vesting period |  |  | 5 years |  |  |  |
Share Award Plans | RMR LLC | Trustees |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common shares awarded (in shares) |  |  | 3,000 | 3,000 | 2,500 |  |
Aggregate market value of shares awarded |  |  | $ 248 | $ 319 | $ 228 |  |
Market value of shares awarded to each Trustee |  |  | $ 50 | $ 64 | $ 46 |  |
Subsequent Event |  |  |  |  |  |  |
Scheduled to vest unvested shares |  |  |  |  |  |  |
Distribution to common shareholders (in dollars per share) | $ 0.39 |  |  |  |  |  |
Distribution declared to common shareholders (in dollars per share) |  |  |  |  |  | $ 0.39 |
Distribution declared to common shareholders |  |  |  |  |  | $ 92,715 |
Dividends | $ 92,715 |  |  |  |  |  |

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