Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Tables)

v3.10.0.1
Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Stock options
$
1,277

 
$
834

 
$
3,571

 
$
2,843

Restricted stock units
2,371

 
1,724

 
6,676

 
5,434

Total
$
3,648

 
$
2,558

 
$
10,247

 
$
8,277

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,
 
2018
 
2017
 
2018
 
2017
Expected option term
4.30 years
 
4.35 years
 
4.49 years
 
4.54 years
Expected stock price volatility
27.75%
 
28.79%
 
28.41%
 
28.91%
Risk-free interest rate
2.81%
 
1.68%
 
2.47%
 
1.72%
Expected annual dividend yield
1.01%
 
1.23%
 
1.15%
 
1.30%
Weighted average grant date fair value
$21.37
 
$13.47
 
$18.80
 
$13.03
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,
 
2018
 
2017
 
2018
 
2017
Vesting period
3.51 years
 
4.03 years
 
3.88 years
 
3.87 years
Expected annual dividend yield
1.01%
 
1.23%
 
1.15%
 
1.30%
Estimated average grant date fair value per restricted stock unit
$84.32
 
$55.61
 
$73.10
 
$52.65