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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