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Shareholders' Equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Apr. 19, 2018
Apr. 03, 2018
Feb. 26, 2018
Jan. 01, 2018
Mar. 31, 2018
May 01, 2018
Dec. 31, 2017
Share Awards              
Cash distribution to common shareholders (in dollars per share)     $ 0.43        
Distribution paid to common shareholders     $ 42,632        
Preferred units of limited partnership         $ 20,496   $ 20,496
Subsequent Event              
Share Awards              
Distribution paid to common shareholders $ 42,634            
Distribution payable to common shareholders (in dollars per share) $ 0.43            
Former Employee of RMR LLC              
Share Awards              
Stock repurchased (in shares)       617      
Stock repurchased (in dollars per share)       $ 18.54      
Share Award Plan | Common shares | Trustees | Subsequent Event              
Share Awards              
Shares granted (in dollars per share)   $ 13.59          
Shares granted (in shares)   3,000          
Series A Cumulative Preferred Units              
Share Awards              
Temporary equity (in shares)         1,813,504    
Redemption percentage         5.50%    
Series A Cumulative Preferred Units | Subsequent Event              
Share Awards              
Redemption price (in dollars per share)           $ 11.15  
Redemption amount           $ 20,310