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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Stock Based Compensation Expense
Stock based compensation expense is summarized as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2020
 
2019
 
2020
 
2019
(in thousands)
 
 
 
 
 
 
 
Stock-based compensation expense
$
6,492

 
$
5,755

 
$
10,113

 
$
11,384
Summary of Restricted Stock Units Activity
RSU activity for the six months ended June 30, 2020 is summarized as follows: 
 
Number
of Shares
 
Weighted Average
Grant Date
Fair Value
Outstanding at December 31, 2019
528,376

 
$
115.74

Granted
210,264

 
$
86.36

Forfeited
(3,263
)
 
$
121.03

Settled
(178,859
)
 
$
110.77

Outstanding at June 30, 2020
556,518

 
$
106.21