XML 57 R41.htm IDEA: XBRL DOCUMENT v3.20.4
Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Stock-Based Compensation Expense
Stock-based compensation expense is summarized as follows: 
 Years Ended December 31,
(in thousands)202020192018
Stock-based compensation expense$21,481 $22,232 $23,116 
Summary of Restricted Stock Units Activity
RSU activity, inclusive of PSUs, for the year ended December 31, 2020 is summarized as follows: 
Number
of shares		Weighted Average
Grant Date
Fair Value
Outstanding at December 31, 2019528,376 $115.74 
Granted211,660 $86.73 
Forfeited(10,734)$106.28 
Settled(196,117)$110.93 
Outstanding at December 31, 2020533,185 $106.19 
Grant-date Intrinsic Value of RSUs Granted
The grant-date intrinsic value of RSUs granted during the year ended December 31, 2020 was $18.4 million.
Years Ended December 31,
(in millions, except per share values)202020192018
Weighted-average grant-date fair value per share$86.73 $108.42 $131.16 
Fair value of RSUs vested$21.8 $17.8 $12.5 
Summary of Stock Option Activity
Stock option activity for the year ended December 31, 2020 is summarized as follows: 
Number
of shares		Weighted
Average
Exercise Price
Outstanding at December 31, 20196,654 $39.35 
Exercised(5,461)$35.89 
Outstanding at December 31, 20201,193 $55.18 
Vested and exercisable at December 31, 20201,193 $55.18