XML 39 R16.htm IDEA: XBRL DOCUMENT v2.4.0.8
Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2014
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,
 
2014
 
2013
Dividend yield
1.50 - 1.51%

 
1.50 - 1.53%

Volatility - stock option plans
36
%
 
38
%
Volatility - stock purchase rights plans
20
%
 
21
%
Risk free interest rates
0.11 - 2.27%

 
0.12 - 1.40%

Expected life (years) - stock option plans
6.52 - 7.43

 
5.91 - 7.43

Expected life (years) - stock purchase rights plans
1

 
1

Weighted average fair value of stock options granted during the period
$
14.08

 
$
11.17

Weighted average fair value of stock purchase rights granted during the period
$
9.60

 
$
9.43
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,
 
2014
 
2013
 
2014
 
2013
Stock compensation expense
$
10,049

 
$
11,015

 
$
32,220

 
$
33,060

Recognized tax benefit
$
988

 
$
943

 
$
3,115

 
$
2,492