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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Stock-based Compensation Expense
Stock-based compensation expense is summarized as follows:
 
Three Months Ended March 31,
(in thousands)
2020
 
2019
Stock-based compensation expense
$
3,621

 
$
5,629
Summary of Restricted Stock Units Activity
RSU activity for the three months ended March 31, 2020 is summarized as follows: 
 
Number
of Shares
 
Weighted Average
Grant Date
Fair Value
Outstanding at December 31, 2019
528,376

 
$
115.74

Granted
190,372

 
$
86.81

Forfeited
(1,789
)
 
$
123.14

Settled
(123,090
)
 
$
111.65

Outstanding at March 31, 2020
593,869

 
$
107.29
Summary of Stock Option Activity
Stock option activity for the three months ended March 31, 2020 is summarized as follows: 
 
Number
of Shares
 
Weighted
Average
Exercise Price
Outstanding at December 31, 2019
6,654

 
$
39.35

Exercised
(3,145
)
 
$
31.74

Outstanding, vested and exercisable at March 31, 2020
3,509

 
$
46.17