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Shareholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 6 Months Ended
Jul. 31, 2011
May 31, 2011
Aug. 31, 2010
Jun. 30, 2011
Jun. 30, 2010
May 16, 2011
Dec. 31, 2010
Distributions              
Distribution to common shareholders (in dollars per share) $ 0.37 $ 0.37 $ 0.36        
Distribution to common shareholders $ 56,748 $ 52,490 $ 45,869 $ 104,976 $ 91,721    
Common shares of beneficial interest              
Common shares of beneficial interest granted (in shares)           2,000  
Common shares of beneficial interest, par value (in dollars per share)       $ 0.01   $ 0.01 $ 0.01
Common stock price per share which is the closing price at New York Stock Exchange (in dollars per share)           $ 23.43  
Number of trustees           5  
Common shares issued in public offering (in shares) 11,500,000            
Net proceeds from issuance of common shares issued in public offering 247,500     (103)      
Distribution declared in July 2011
              
Distributions              
Distribution declared to common shareholders (in dollars per share) $ 0.37            
Distribution declared to common shareholders $ 56,748