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Employee Compensation (Tables)
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions The grant date fair value of the stock options was estimated using the Black-Scholes option pricing method with the following assumptions:
Dividend yield (%)0 %
Expected volatility (%)
32-35%
Risk-free interest rate (%)
0.8-1.3%
Expected term (years)
5.1-7.0
The grant date fair value of the PSUs were estimated using the Monte Carlo simulation method with the following assumptions:
Dividend yield (%)0 %
Expected volatility (%)40 %
Risk-free interest rate (%)
0.1-0.6 %
Share-based Payment Arrangement, Expensed and Capitalized, Amount The following table summarizes the components of stock-based compensation expense recognized for the periods presented:
Three months ended September 30,Nine months ended September 30,
(in thousands)2021202020212020
Cost of services$451 $— $502 $— 
Selling, general, and administrative expense18,792 — 152,008 — 
Total$19,243 $— $152,510 $—