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Shareholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 1 Months Ended 9 Months Ended
Aug. 21, 2014
May 21, 2014
Feb. 21, 2014
Apr. 30, 2014
Jun. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
Sep. 12, 2014
Jun. 05, 2014
item
Jul. 07, 2014
Subsequent event
Jul. 31, 2014
Subsequent event
Sep. 30, 2014
RMR
Distributions                        
Distribution to common shareholders (in dollars per share) $ 0.39 $ 0.39 $ 0.39             $ 0.39    
Distribution to common shareholders $ 79,469 $ 73,397 $ 73,386     $ 226,252 $ 215,559     $ 79,515    
Common shares issued as a part of compensation under business management agreement                     12,463 85,986
Common shares issued in public offering       15,525,000 15,525,000              
Net proceeds after underwriting discounts from issuance of common shares issued in public offering       $ 323,318 $ 323,318 $ 322,962 $ 261,813          
Common shares of beneficial interest                        
Common shares of beneficial interest granted               81,700 2,500      
Common stock price per share which is the closing price at New York Stock Exchange (in dollars per share)               $ 21.42 $ 24.50      
Number of trustees                 5