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Related Person Transactions - Investment in RMR Inc (Details) $ in Thousands | Mar. 31, 2018 USD ($) agreement shares | Dec. 31, 2017 USD ($)
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RMR Inc | Class A common shares |  |
Related person transactions |  |
Number of management agreements | agreement | 2 |
Equity securities investment (in shares) | 2,637,408 |
Five Star |  |
Related person transactions |  |
Equity securities investment (in shares) | 4,235,000 |
AIC |  |
Related person transactions |  |
Equity method investments | $ | $ 8,136 | $ 8,185

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