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Related Person Transactions (Details) $ / shares in Units, $ in Thousands |  | 9 Months Ended |
--- | --- | --- | ---
Jul. 01, 2019 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) agreement shares | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Related person transactions |  |  |  |
Proceeds from sale of RMR Inc. common shares, net |  | $ 98,557 | $ 0 |
RMR Inc | Class A common shares |  |  |  |
Related person transactions |  |  |  |
Number of management agreements | agreement |  | 2 |  |
Proceeds from sale of RMR Inc. common shares, net | $ 98,557 |  |  |
Five Star |  |  |  |
Related person transactions |  |  |  |
Equity securities investment (in shares) | shares |  | 423,500 |  |
Investment owned, percentage of total shares outstanding |  | 8.30% |  |
AIC |  |  |  |
Related person transactions |  |  |  |
Equity method investments |  | $ 9,340 |  | $ 8,632
RMR LLC | Five Star |  |  |  |
Related person transactions |  |  |  |
Investment owned, percentage of total shares outstanding |  | 35.40% |  |
Class A common shares | RMR Inc |  |  |  |
Related person transactions |  |  |  |
Shares sold (in shares) | shares | 2,637,408 |  |  |
Sale of stock, price per share (in dollars per share) | $ / shares | $ 40.00 |  |  |

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