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Equity (Details 3) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Stock Options
       
Stock Based Compensation Plans        
Number of stock options that are scheduled to vest in the future (in shares) 5,000   5,000  
Compensation expense $ 4,000 $ 4,000 $ 8,000 $ 8,000
Compensation expense to be recognized 1,000   1,000  
Restricted stock
       
Stock Based Compensation Plans        
Compensation expense $ 454,000 $ 359,000 $ 902,000 $ 713,000
Restricted stock | $ 31.77 per share
       
Stock Based Compensation Plans        
Number of shares granted (in shares)     56,200  
Price per share     $ 31.77  
Vesting period     P5Y  
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        
Vested (in shares)     14,000  
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 P3Y      
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       P3Y