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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 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
May 21, 2014
Feb. 21, 2014
Apr. 30, 2014
Jun. 30, 2014
Jun. 30, 2014
Jun. 30, 2013
Jun. 05, 2014
item
Jul. 31, 2014
Subsequent event
Jul. 07, 2014
Subsequent event
Jun. 30, 2014
RMR
Jun. 30, 2014
RMR
Distributions                      
Distribution to common shareholders (in dollars per share) $ 0.39 $ 0.39                  
Distribution to common shareholders $ 73,397 $ 73,386     $ 146,783 $ 142,206          
Distribution declared to common shareholders (in dollars per share)                 $ 0.39    
Distribution declared to common shareholders                 79,469    
Common shares issued as a part of compensation under business management agreement               11,223   30,900 50,837
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 $ 322,864 $ 261,813          
Common shares of beneficial interest                      
Common shares of beneficial interest granted             2,500        
Common stock price per share which is the closing price at New York Stock Exchange (in dollars per share)             $ 24.50        
Number of trustees             5