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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2022
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)20222021
Stock-based compensation expense$9,547 $7,995 
Summary of Restricted Stock Units Activity
RSU activity, inclusive of PSUs, for the three months ended March 31, 2022 is summarized as follows: 
Number
of Shares		Weighted Average
Grant Date
Fair Value
Outstanding at December 31, 2021430,730 $138.01 
Granted162,541 $194.78 
Forfeited(68)$222.45 
Settled(153,989)$117.39 
Outstanding at March 31, 2022439,214 $166.24