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Shareholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 9 Months Ended
Oct. 09, 2013
Sep. 13, 2013
Aug. 23, 2013
May 24, 2013
May 21, 2013
item
Mar. 27, 2013
Feb. 22, 2013
Sep. 30, 2013
Dec. 31, 2012
Distributions                  
Cash distribution to common shareholders (in dollars per share) $ 0.43   $ 0.43 $ 0.43     $ 0.43    
Distribution to common shareholders $ 23,531   $ 23,510 $ 23,505     $ 23,497    
Share Issuances                  
Number of shares issued for the incentive fee for services rendered           20,230      
Common shares of beneficial interest, par value (in dollars per share)           $ 0.01   $ 0.01 $ 0.01
Incentive fee for services rendered by RMR           485      
Shares granted for equity compensation plan   48,350     2,000        
Closing share price of the entity's common shares (in dollars per share)   $ 23.61     $ 26.60        
Number of trustees         5        
Dilutive securities               $ 0