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Stock Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based 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
 

2014

     2     48     1     6   

2013

     0     51     1     6   

2012

     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, 2014 is as follows:

 

     Shares      Weighted
Average
Exercise
Price
     Weighted
Average
Contractual
Life
 

Outstanding, beginning of year

     3,232,423       $ 32.89      

Granted

     87,000         51.04      

Exercised

     (522,032      31.12      

Forfeited

     (12,200      43.89      

Expired

     (10,600      28.13      
  

 

 

    

 

 

    

Outstanding, end of year

  2,774,591    $ 33.76      6.66   
  

 

 

    

 

 

    

 

 

 

Exercisable at end of year

  1,622,891    $ 27.54      5.63   
  

 

 

    

 

 

    

 

 

 

Summary of ESPP Share Activity

The following is a summary of 2009 ESPP share activity for the year ended December 31, 2014:

 

     Shares  

Available for future purchases, January 1, 2014

     327,689   

Additional shares reserved under 2009 ESPP

     80,209   

Purchases

     (100,450
  

 

 

 

Available for future purchases, December 31, 2014

  307,448