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Equity (Details 3) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Stock Options
       
Stock Based Compensation Plans        
Number of shares exercised     22,000 35,000
Value of options exercised $ 523,000 $ 746,000 $ 523,000 $ 746,000
Market value on the date of exercise 865,000 1,136,000 865,000 1,136,000
Options outstanding at end of the period (in shares) 73,334   73,334  
Stock options issued (in shares)     0 0
Compensation expense   4,000   8,000
Restricted stock
       
Stock Based Compensation Plans        
Compensation expense 523,000 454,000 1,508,000 902,000
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
Restricted stock | $ 31.87 per share | Vesting ratably over three-year period from the grant date
       
Stock Based Compensation Plans        
Number of shares granted       8,000
Price per share       $ 31.87
Vesting period       3 years
Restricted stock | $ 46.54 per share
       
Stock Based Compensation Plans        
Number of shares granted 8,400      
Price per share $ 46.54      
Vesting period 3 years      
Restricted stock | $ 41.83 per share
       
Stock Based Compensation Plans        
Number of shares granted 6,000      
Price per share $ 41.83      
Vesting period 3 years