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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Stock Based Compensation Expense
Stock based compensation expense is summarized as follows:
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
(in thousands)
Stock-based compensation expense$6,299 $5,000 $16,412 $16,384 
Summary of Restricted Stock Units Activity
RSU activity, inclusive of PSUs, for the nine months ended September 30, 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(3,844)$118.95 
Settled(181,091)$110.79 
Outstanding at September 30, 2020555,101 $106.27