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Equity (Details 3) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Stock Options
       
Stock Based Compensation Plans        
Compensation expense $ 2,000 $ 5,000 $ 10,000 $ 13,000
Restricted stock
       
Stock Based Compensation Plans        
Compensation expense $ 443,000 $ 369,000 $ 1,345,000 $ 1,082,000
Restricted stock | $ 31.87 per share
       
Stock Based Compensation Plans        
Number of shares granted (in shares)     8,000  
Price per share     $ 31.87  
Vesting period     3 years  
Restricted stock | $ 31.77 per share
       
Stock Based Compensation Plans        
Number of shares granted (in shares)     56,200  
Price per share     $ 31.77  
Restricted stock | $ 31.77 per share | Vesting on June 15, 2015
       
Stock Based Compensation Plans        
Price per share     $ 31.77  
Vested (in shares)     30,000  
Restricted stock | $ 31.77 per share | Vesting on January 10, 2016
       
Stock Based Compensation Plans        
Price per share     $ 31.77  
Vested (in shares)     12,200  
Restricted stock | $ 31.77 per share | Vesting ratably over five-year period from the grant date
       
Stock Based Compensation Plans        
Price per share     $ 31.77  
Vested (in shares)     14,000  
Vesting period     5 years  
Restricted stock | $ 28.70 per share
       
Stock Based Compensation Plans        
Number of shares granted (in shares)       6,000
Price per share       $ 28.70
Vesting period       3 years