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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2015
Share-based Compensation [Abstract]  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Methods 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,
 
2015
 
2014
Dividend yield
1.60
%
 
1.50 - 1.51%

Volatility - stock option plans
29 - 34%

 
36
%
Volatility - stock purchase rights plans
20
%
 
20
%
Risk free interest rates
0.30 - 2.04%

 
0.11 - 2.27%

Expected life (years) - stock option plans
6.41 - 7.47

 
6.52 - 7.43

Expected life (years) - stock purchase rights plans
1

 
1

Weighted average fair value of stock options granted during the period
$
13.44

 
$
14.08

Weighted average fair value of stock purchase rights granted during the period
$
10.45

 
$
9.60
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,
 
2015
 
2014
 
2015
 
2014
Stock compensation expense
$
10,919

 
$
10,049

 
$
32,489

 
$
32,220

Recognized tax benefit
$
1,571

 
$
988

 
$
4,305

 
$
3,115