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Share-based awards (Tables)

9 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement [Abstract]

Summary of stock option activity

The following table summarizes option activity for the nine months ended September 30, 2023:

			Options Outstanding Number of Shares						Weighted Average Exercise Price						Weighted Average Remaining Contractual Life
Outstanding at December 31, 2022			1,378,119						$	119.86					4.69
Granted			82,472						$	232.48
Exercised			(377,614)						$	96.67
Canceled/expired			(6,885)						$	116.33
Outstanding at September 30, 2023			1,076,092						$	136.65					4.45
Exercisable at September 30, 2023			804,953						$	113.75					3.91

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, 2023						September 30, 2022
Weighted average grant date fair value			$	85.12					$	68.40
Assumptions:
Expected volatility			33		%				31		%
Dividend yield			—		%				—		%
Risk-free interest rate			3.98		%				1.85		%
Expected life			5 years						5 years

Summary of RSU and PSU activity

The following table summarizes RSU and PSU activity for the nine months ended September 30, 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, 2022			152,420						$	192.29					582,612						$	207.73
Granted			60,374						$	232.51					306,780						$	218.68
Shares vested			(47,026)						$	159.57					(178,781)						$	186.35
Forfeited			—						$	—					(59,260)						$	211.45
Outstanding at September 30, 2023			165,768						$	216.22					651,351						$	218.41

Schedule of non-cash stock compensation expense

Stock compensation expense for the three and nine months ended September 30, 2023 and September 30, 2022 has been allocated as follows:

			Three Months Ended												Nine Months Ended
			September 30, 2023						September 30, 2022						September 30, 2023						September 30, 2022
			(in thousands)												(in thousands)
Direct costs			$	6,637					$	6,285					$	18,725					$	17,117
Selling, general and administrative			$	9,828					$	11,232					$	29,097					$	38,586
Total			$	16,465					$	17,517					$	47,822					$	55,703

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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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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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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