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Share-based awards (Tables)

9 Months Ended

Sep. 30, 2024

Share-Based Payment Arrangement [Abstract]

Summary of Stock Option Activity

The following table summarizes option activity for the nine months ended September 30, 2024:

			Options Outstanding Number of Shares						Weighted Average Exercise Price						Weighted Average Remaining Contractual Life
Outstanding at December 31, 2023			902,806						$	142.96					4.42
Granted			68,380						$	325.51
Exercised			(275,805)						$	117.37
Forfeited			(17,341)						$	239.54
Outstanding at September 30, 2024			678,040						$	169.30					4.29
Exercisable at September 30, 2024			461,732						$	133.30					3.48

Schedule of Weighted Average Fair Values and Assumptions Used

The weighted average grant date fair values and assumptions used were as follows:

			Nine Months Ended
			September 30, 2024						September 30, 2023
Weighted average grant date fair value			$	115.76					$	85.12
Assumptions:
Expected volatility			36		%				33		%
Dividend yield			—		%				—		%
Risk-free interest rate			4.20		%				4.18		%
Expected life			4.3 years						5 years

Summary of RSU and PSU Activity

The following table summarizes RSU and PSU activity for the nine months ended September 30, 2024:

			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, 2023			105,256						$	226.29					621,011						$	218.27
Granted			48,626						$	325.51					245,750						$	318.49
Shares vested			(9,975)						$	177.38					(115,570)						$	221.85
Forfeited			(94,178)						$	262.66					(62,360)						$	233.79
Outstanding at September 30, 2024			49,729						$	264.25					688,831						$	251.87

Schedule of Non-Cash Stock Compensation Expense

Stock compensation expense for the three and nine months ended September 30, 2024 and September 30, 2023 has been allocated as follows:

			Three Months Ended									Nine Months Ended
			September 30, 2024			September 30, 2023						September 30, 2024			September 30, 2023
			(in thousands)
Direct costs			$	7,745		$	6,637					$	21,765		$	18,725
Selling, general and administrative			5,293			9,828						19,418			29,097
Total			$	13,038		$	16,465					$	41,183		$	47,822

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Schedule of Non Cash Stock Compensation Expense.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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-Topic 718
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-Name Accounting Standards Codification
-Section 50
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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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