Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Tables)

v3.8.0.1
Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Share-based Compensation [Abstract]  
Schedule Of Stock-Based Compensation Expense
Stock-based compensation expense consisted of the following (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Stock options
$
834

 
$
1,008

 
$
2,843

 
$
2,989

Restricted stock units
1,724

 
1,993

 
5,434

 
5,465

Total
$
2,558

 
$
3,001

 
$
8,277

 
$
8,454

Schedule Of Weighted Average Assumptions For Employee Stock Options
The following table presents the weighted average assumptions for stock options granted in the periods:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Expected option term
4.35 years
 
4.37 years
 
4.54 years
 
4.63 years
Expected stock price volatility
28.79%
 
29.34%
 
28.91%
 
29.80%
Risk-free interest rate
1.68%
 
0.94%
 
1.72%
 
1.17%
Expected annual dividend yield
1.23%
 
1.17%
 
1.30%
 
1.20%
Weighted average grant date fair value
$13.47
 
$13.12
 
$13.03
 
$13.38
Schedule Of Weighted Average Assumptions For Restricted Stock Units
The following table presents the weighted average assumptions for restricted stock units granted in the periods:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Vesting period
4.03 years
 
4.01 years
 
3.87 years
 
3.83 years
Expected annual dividend yield
1.23%
 
1.17%
 
1.30%
 
1.16%
Estimated average grant date fair value per restricted stock unit
$55.61
 
$55.43
 
$52.65
 
$55.94