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Stock Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Weighted Average Fair Value of Options Granted

The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions used:

 

Grant Year

   Dividend
Yield
    Expected
Volatility
    Risk Free
Interest Rate
    Expected
Lives
 

2013

     0     51     1     6   

2012

     0     52     2     5   

2011

     0     52     2     5   
Stock Option Transactions under Various Stock-Based Employee Compensation Plans

Information regarding the 1996 Plan for the year ended December 31, 2013 is as follows:

 

     Shares     Weighted
Average
Exercise
Price
     Weighted
Average
Contractual
Life
 

Outstanding, beginning of year

     2,124,886      $ 22.36      

Granted

     1,807,000        42.31      

Exercised

     (682,263     24.90      

Canceled

     (17,200     38.73      
  

 

 

   

 

 

    

Outstanding, end of year

     3,232,423      $ 32.89         7.37   
  

 

 

   

 

 

    

 

 

 

Exercisable at end of year

     1,737,823      $ 25.16         5.95   
  

 

 

   

 

 

    

 

 

Summary of ESPP Share Activity

The following is a summary of 2009 ESPP share activity for the year ended December 31, 2013:

 

     Shares  

Available for future purchases, January 1, 2013

     358,950   

Additional shares reserved under 2009 ESPP

     78,963   

Purchases

     (110,224
  

 

 

 

Available for future purchases, December 31, 2013

     327,689