EMPLOYEE COMPENSATION PLANS (Tables)

12 Months Ended

Dec. 31, 2022

EMPLOYEE COMPENSATION PLANS [Abstract]

Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

The following table presents the total equity-based compensation expense (stock options and RSUs) for the years ended December 31, 2022, 2021 and 2020 (in thousands):

	Year Ended December 31,
	2022		2021		2020
Equity-based compensation expense recognized in Cost of services	$	7,175	$	6,099	$	4,254
Equity-based compensation expense recognized in Selling, general and administrative		10,396		10,326		8,253
Total equity-based compensation expense	$	17,571	$	16,425	$	12,507
Total tax benefit recognized	$	5,512	$	8,673	$	3,471

Summary of non-vested RSU's and performance-based RSU's

		Weighted
		Average
		Grant Date
	Shares	Fair Value
Unvested as of December 31, 2021	885,612	$	61.73
Granted	1,120,176	$	65.36
Vested	(320,593)	$	55.17
Cancellations/expirations	(326,472)	$	65.80
Unvested as of December 31, 2022	1,358,723	$	65.37