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Equity (Details 3) (USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Stock Options
   
Stock Based Compensation Plans    
Number of stock options that are scheduled to vest in the future 5,000  
Compensation expense $ 4,000 $ 4,000
Compensation expense to be recognized 6,000  
Restricted stock
   
Stock Based Compensation Plans    
Compensation expense $ 448,000 $ 354,000
Restricted stock | $ 31.77 per share
   
Stock Based Compensation Plans    
Number of shares granted (in shares) 56,200  
Price per share $ 31.77  
Vested (in shares) 14,000  
Vesting period (in years) 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