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Share-based awards (Tables)
 3 Months Ended
Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Summary of stock option activity
The following table summarizes option activity for the three months ended March 31, 2023:
 Options
Outstanding
Number of Shares 		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Life
Outstanding at December 31, 20221,378,119 $119.86 4.69
Granted76,066 $233.88 
Exercised(136,649)$94.66 
Canceled/expired(6,499)$115.46 
Outstanding at March 31, 20231,311,037 $129.12 4.83
Exercisable at March 31, 20231,003,832 $108.94 4.29
Schedule of weighted average fair values and assumptions used The weighted average grant date fair values and assumptions used were as follows:
Three Months Ended
March 31, 2023March 31, 2022
Weighted average grant date fair value$85.75 $68.24 
Assumptions:  
Expected volatility33 %30 %
Dividend yield— %— %
Risk-free interest rate4.22 %1.74 %
Expected life5 years5 years
Summary of RSU and PSU activity The following table summarizes RSU and PSU activity for the three months ended March 31, 2023:
  
PSU
Outstanding
Number of
Shares		 
PSU
Weighted
Average Grant Date
Fair Value		 
RSU
Outstanding
Number of
Shares		 
RSU
Weighted
Average Grant Date
Fair Value
Outstanding at December 31, 2022152,420 $192.29 582,612 $207.73 
Granted55,772 $233.88 26,466 $233.88 
Shares vested(45,460)$159.33 (22,758)$191.74 
Forfeited— $— (16,523)$208.48 
Outstanding at March 31, 2023162,732 $215.75 569,797 $207.94 
Schedule of non-cash stock compensation expense
Non-cash stock compensation expense for the three months ended March 31, 2023 and March 31, 2022 has been allocated as follows:
Three Months Ended
March 31, 2023March 31, 2022
(in thousands)
Direct costs$5,668 $4,999 
Selling, general and administrative9,091 13,904 
 $14,759 $18,903