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Equity (Details 3) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Stock Options
   
Stock Based Compensation Plans    
Number of shares exercised 22,000 10,000
Value of options exercised $ 523,000 $ 151,000
Market value on the date of exercise 865,000 305,000
Options outstanding at end of the period (in shares) 73,334  
Stock options issued (in shares) 0 0
Compensation expense   4,000
Restricted stock
   
Stock Based Compensation Plans    
Compensation expense 985,000 448,000
Shares vested due to accelerating 18,180  
Compensation expense related to the accelerated vesting $ 457,000  
Restricted stock | $ 36.26 per share | Vesting on June 1, 2016
   
Stock Based Compensation Plans    
Number of shares granted 20,000  
Price per share $ 36.26  
Restricted stock | $ 31.77 per share
   
Stock Based Compensation Plans    
Number of shares granted   56,200
Price per share   $ 31.77
Restricted stock | $ 31.77 per share | Vesting on June 15, 2015
   
Stock Based Compensation Plans    
Vested (in shares)   30,000
Restricted stock | $ 31.77 per share | Vesting on January 10, 2016
   
Stock Based Compensation Plans    
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
Vesting period   5 years