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Equity (Details 3) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Stock Options
       
Stock Based Compensation Plans        
Number of shares exercised     22,000 85,000
Value of options exercised $ 523,000 $ 1,926,000 $ 523,000 $ 1,926,000
Market value on the date of exercise 865,000 2,761,000 865,000 2,761,000
Options outstanding at end of the period (in shares) 73,334   73,334  
Stock options vested (in shares)     73,334  
Stock options granted (in shares)     0 0
Restricted stock
       
Stock Based Compensation Plans        
Compensation expense 542,000 443,000 2,050,000 1,345,000
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