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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Apr. 02, 2020
Mar. 13, 2020
Jan. 09, 2020
Mar. 31, 2020
Mar. 31, 2019
Share Awards          
Cash distribution to common shareholders (in dollars per share)       $ 0.55  
Distributions to common shareholders       $ 26,511 $ 26,445
Subsequent Event          
Share Awards          
Dividends declared (in dollars per share) $ 0.55        
Dividends declared $ 26,500        
Former Employee of RMR LLC          
Share Awards          
Share repurchases (in shares)   602 410    
Share repurchase price (in dollars per share)   $ 22.65 $ 32.89