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Shareholders' Equity (Details) (Award Plans, USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
month
Dec. 31, 2010
Dec. 31, 2009
Shareholders' Equity      
Shares of common shares reserved to be issued under share award plans 3,128,791    
Common shares granted under equity compensation plan 77,300 63,900 63,700
Remaining shares of common shares reserved to be issued under share award plans 2,437,022    
Number of Shares      
Unvested shares, beginning of year 93,432 74,062 44,877
Shares granted 77,300 63,900 63,700
Shares vested (56,622) (44,530) (34,515)
Unvested shares, end of year 114,110 93,432 74,062
Weighted Average Grant Date Fair Value      
Unvested shares, beginning of year (in dollars per share) $ 22.31 $ 23.20 $ 27.10
Shares granted (in dollars per share) $ 24.20 $ 22.89 $ 19.27
Shares vested (in dollars per share) $ 23.76 $ 22.63 $ 18.06
Unvested shares, end of year (in dollars per share) $ 22.70 $ 22.31 $ 23.20
Unvested shares, scheduled to vest      
2012 42,190    
2013 34,340    
2014 24,120    
2015 13,460    
Estimated future compensation expense $ 2,622    
Closing price of common shares (in dollars per share) $ 22.98    
Weighted average period over which the compensation expense will be recorded (in months) 22    
Compensation expense 1,405 1,340 1,006
Trustees
      
Shareholders' Equity      
Common shares granted under equity compensation plan 2,000 2,000 2,000
Market value of common shares awarded 243 260 127
Market value of common stock issued per trustee 49 52 25
Number of Shares      
Shares granted 2,000 2,000 2,000
RMR | Officers and employees of RMR
      
Shareholders' Equity      
Common shares granted under equity compensation plan 67,300 53,900 52,700
Market value of common shares awarded $ 1,628 $ 1,186 $ 1,089
Vesting period for shares awarded (in years) 5 years    
Number of Shares      
Shares granted 67,300 53,900 52,700