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Equity Incentive Program (Tables)
3 Months Ended
Mar. 31, 2012
Equity Incentive Program [Abstract]  
Assumptions used in determining fair value of stock appreciation rights and performance shares awarded during the period
The fair value of each SAR grant was estimated on the date of grant using the Black-Scholes option pricing model. The performance share awards are market condition awards and have been assessed at fair value on the date of grant using the Monte Carlo simulation model. The following assumptions were used in determining the fair value of the SARs and performance shares awarded during the respective periods:

   
SARs
  
Performance Shares
 
   
Three Months Ended March 31,
  
Three Months Ended March 31,
 
   
2012
  
2011
  
2012
  
2011
 
Risk-free interest rate
  1.05%  2.68%  0.37%  1.34%
Dividend yield
  2.03%  1.70%  2.03%  1.61%
Expected life (years)
  5.7   5.8   2.9   2.9 
Volatility
  36.41%  33.56%  34.10%  40.48%
Grant price
 $65.38  $66.59   n/a   n/a 
Fair value at date of grant
 $18.51  $20.13  $71.98  $91.41 
 
Stock-based incentive plans compensation expense
Stock-based compensation is reported within selling and administrative expenses in the accompanying Unaudited Condensed Consolidated Statement of Earnings. The following table summarizes the Company’s compensation expense relating to all stock-based incentive plans:
 
   
Three Months Ended March 31,
 
   
2012
  
2011
 
Pre-tax compensation expense
 $8,574  $8,033 
Tax benefit
  (3,107)  (2,811)
Total stock-based compensation expense, net of tax
 $5,467  $5,222