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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2012
Share-based Compensation [Abstract]  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used
The fair value of each option grant is estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions:
 
 
 
 
 
Nine months ended September 30,
 
2012
 
2011
Dividend yield
1.30 - 1.35%

 
.97 - .98%

Volatility - stock option plans
38 - 39%

 
38 - 40%

Volatility - stock purchase rights plans
34
%
 
26
%
Risk free interest rates
.19 - 1.43%

 
.19 - 2.84%

Expected life (years) - stock option plans
5.79 - 7.26

 
5.50 - 7.11

Expected life (years) - stock purchase rights plans
1

 
1

Weighted average fair value of stock options granted during the period
$
13.53

 
$
19.35

Weighted average fair value of stock purchase rights granted during the period
$
9.70

 
$
11.70
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Total stock compensation expense and the total related tax benefit recognized are as follows:
 
Three months ended
 
Nine months ended
 
September 30,
 
September 30,
 
2012
 
2011
 
2012
 
2011
Stock compensation expense
$
11,320

 
$
12,738

 
$
32,846

 
$
33,446

Recognized tax benefit
$
996

 
$
40

 
$
1,371

 
$
117