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Share-based awards (Tables)

9 Months Ended

Sep. 30, 2022

Share-Based Payment Arrangement [Abstract]

Summary of stock option activity

The following table summarizes option activity for the nine months ended September 30, 2022:

			Options Outstanding Number of Shares						Weighted Average Exercise Price												Weighted Average Remaining Contractual Life
Outstanding at December 31, 2021			1,695,460						$	104.79											5.39
Granted			108,643						$	229.94
Exercised			(276,901)						$	104.70
Canceled/expired			(56,143)						$	141.35
Outstanding at September 30, 2022			1,471,059						$	119.10											4.85
Exercisable at September 30, 2022			1,100,950						$	101.29											4.31

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, 2022						September 30, 2021
Weighted average grant date fair value			$	68.40					$	49.15
Assumptions:
Expected volatility			31		%				30		%
Dividend yield			—		%				—		%
Risk-free interest rate			1.85		%				0.78		%
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, 2022:

			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, 2021			154,190						$	160.23								572,785						$	191.20
Granted			64,682						$	214.25								291,043						$	217.51
Shares vested			(45,567)						$	140.18								(188,658)						$	174.17
Forfeited			(14,542)						$	182.33								(68,261)						$	203.82
Outstanding at September 30, 2022			158,763						$	189.13								606,909						$	207.94

Schedule of non-cash stock compensation expense

Non-cash stock compensation expense for the nine months ended September 30, 2022 and September 30, 2021 has been allocated as follows:

			Three Months Ended												Nine Months Ended
			September 30, 2022						September 30, 2021						September 30, 2022						September 30, 2021
			(in thousands)												(in thousands)
Direct costs			$	6,285					$	8,787					$	17,117					$	13,822
Selling, general and administrative			11,232						17,568						38,586						27,133
Transaction and integration-related expenses			—						73,836						0						73,836
			$	17,517					$	100,191					$	55,703					$	114,791

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Schedule of Non Cash Stock Compensation Expense.

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Summary Of Share Based Compensation Restricted Stock Units Performance Stock Units Award Activity [Table Text Block]

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
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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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