Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Tables)

v3.10.0.1
Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Share-based Compensation [Abstract]  
Schedule Of Stock-Based Compensation Expense
Stock-based compensation expense consisted of the following (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Stock options
$
1,222

 
$
1,005

 
$
2,294

 
$
2,009

Restricted stock units
2,264

 
1,772

 
4,305

 
3,710

Total
$
3,486

 
$
2,777

 
$
6,599

 
$
5,719

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 June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Expected option term
6.47 years
 
6.89 years
 
4.49 years
 
4.56 years
Expected stock price volatility
27.69%
 
28.50%
 
28.41%
 
28.91%
Risk-free interest rate
2.82%
 
1.94%
 
2.47%
 
1.72%
Expected annual dividend yield
0.99%
 
1.26%
 
1.16%
 
1.30%
Weighted average grant date fair value
$26.21
 
$15.98
 
$18.78
 
$13.00
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 June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Vesting period
2.16 years
 
3.08 years
 
3.89 years
 
3.86 years
Expected annual dividend yield
0.99%
 
1.26%
 
1.15%
 
1.30%
Estimated average grant date fair value per restricted stock unit
$87.20
 
$55.06
 
$72.95
 
$52.54