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Related Person Transactions - Accounting for Investment in RMR Inc (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 05, 2015
Sep. 30, 2015
Sep. 30, 2015
Up C Transaction | RMR LLC      
Related person transactions      
Amount of investment acquired $ 60,700    
RMR Inc | RMR LLC | Operating expense      
Related person transactions      
Amortization of other liabilities to reduce business and property management fees     $ 1,202
RMR Inc | Up C Transaction      
Related person transactions      
Fair value of investment 136,278    
Investment at carrying value, including transaction costs $ 138,839    
RMR Inc | Up C Transaction | RMR Inc      
Related person transactions      
Initial other liabilities   $ 76,648 $ 76,648
RMR Inc | Up C Transaction | RMR LLC      
Related person transactions      
Straight line discount amortization period 20 years    
RMR Inc | Up C Transaction | RMR LLC | General and administrative expense      
Related person transactions      
Amortization of other liabilities to reduce business and property management fees   $ 959  
Class A common shares | RMR Inc | Up C Transaction      
Related person transactions      
Number of shares acquired 5,272,787