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Related Person Transactions - Investment in RMR Inc (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 12, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Related person transactions |  |  |  |  |  |
Common stock dividend declared (in dollars per share) | $ 0.39 |  |  |  |  |
Income (loss) recognized arising from equity investments |  | $ 17 | $ 23 | $ 94 | $ 95 |
Change in net unrealized gain(loss) on investments |  | 15,931 | 1,387 | 40,118 | 2,835 |
RMR LLC |  |  |  |  |  |
Related person transactions |  |  |  |  |  |
Rental revenue from related party |  | 61 | 51 | 171 | 102 |
RMR LLC | RMR Inc |  |  |  |  |  |
Related person transactions |  |  |  |  |  |
Initial other liabilities |  | 73,819 |  | 73,819 |  |
AIC |  |  |  |  |  |
Related person transactions |  |  |  |  |  |
Equity method investments, carrying value |  | 7,016 |  | 7,016 |  | $ 6,827
Income (loss) recognized arising from equity investments |  | 17 | 23 | 94 | 95 |
Property insurance premium |  |  |  | 3,607 |  |
Change in net unrealized gain(loss) on investments |  | 43 | (64) | 95 | (19) |
RMR Inc |  |  |  |  |  |
Related person transactions |  |  |  |  |  |
Amortization of other liabilities to reduce business and property management fees |  | $ 943 | $ 243 |  | $ 243 |
RMR Inc | RMR Inc |  |  |  |  |  |
Related person transactions |  |  |  |  |  |
Amortization of other liabilities to reduce business and property management fees |  |  |  | $ 1,886 |  |
Class A common shares | RMR Inc |  |  |  |  |  |
Related person transactions |  |  |  |  |  |
Number of shares purchased |  |  |  | 2,637,408 |  |
Common stock dividend declared (in dollars per share) |  | $ 0.25 |  |  |  |
Dividends received |  |  |  | $ 789 |  |

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