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Related Person Transactions - Accounting for Investment in RMR Inc. (Details) - RMR Inc - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 05, 2015 | Sep. 30, 2015 | Sep. 30, 2015
Related Party Transaction [Line Items] |  |  |
Amount of investment acquired | $ 55,922 |  |
Fair value of investment | 129,722 |  |
Initial other liabilities | $ 72,658 |  |
Investment at carrying value, including transaction costs |  | $ 132,296 | $ 132,296
Straight line discount amortization period | 20 years |  |
Amortization of other liabilities to reduce business and property management fees |  | $ 911 | $ 1,142
Class A common shares |  |  |
Related Party Transaction [Line Items] |  |  |
Shares issued in connection with acquisition | 5,019,121 |  |
Up C Transaction | Common shares |  |  |
Related Party Transaction [Line Items] |  |  |
Shares issued in connection with acquisition | 1,490,000 |  |
Up C Transaction | Class A common shares |  |  |
Related Party Transaction [Line Items] |  |  |
Shares issued in connection with acquisition | 5,019,121 |  |
RMR Trust | Up C Transaction | Class B1 common shares |  |  |
Related Party Transaction [Line Items] |  |  |
Shares issued in connection with acquisition | 1,000,000 |  |
RMR Trust | Up C Transaction | Class B2 common shares |  |  |
Related Party Transaction [Line Items] |  |  |
Shares issued in connection with acquisition | 15,000,000 |  |
RMR Trust | Up C Transaction | Class B member units |  |  |
Related Party Transaction [Line Items] |  |  |
Shares issued in connection with acquisition | 1,000,000 |  |
GOV | Up C Transaction | Common shares |  |  |
Related Party Transaction [Line Items] |  |  |
Shares issued in connection with acquisition | 700,000 |  |
GOV | Up C Transaction | Class A common shares |  |  |
Related Party Transaction [Line Items] |  |  |
Shares issued in connection with acquisition | 1,541,201 |  |
SNH | Up C Transaction | Common shares |  |  |
Related Party Transaction [Line Items] |  |  |
Shares issued in connection with acquisition | 2,345,000 |  |
SNH | Up C Transaction | Class A common shares |  |  |
Related Party Transaction [Line Items] |  |  |
Shares issued in connection with acquisition | 5,272,787 |  |
SIR | Up C Transaction | Common shares |  |  |
Related Party Transaction [Line Items] |  |  |
Shares issued in connection with acquisition | 880,000 |  |
SIR | Up C Transaction | Class A common shares |  |  |
Related Party Transaction [Line Items] |  |  |
Shares issued in connection with acquisition | 3,166,891 |  |

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