SHARE-BASED COMPENSATION AND BENEFIT PLANS (Tables)

9 Months Ended

Sep. 30, 2021

Employee stock option [Member]

Share-Based Compensation and Benefit Plans

Summary of stock options

	Shares	Weighted- Average
	(in thousands)	Exercise Price
Outstanding at December 31, 2020	1,500	$	248.52
Granted	123		479.73
Exercised	(331)		164.42
Forfeited or expired	(21)		367.98
Outstanding at September 30, 2021	1,271	$	290.85
Exercisable at September 30, 2021	856	$	241.60

Black-Scholes option pricing model

	September 30,
	2021		2020
Risk free interest rate	0.81	%	0.90	%
Expected life	6.0	Years	6.1	Years
Expected volatility	30.0	%	26.1	%
Expected dividend yield	—	%	—	%

Summary of activity of share-based compensation and benefit plans

	For the Three Months Ended				For the Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Compensation expense for stock options awarded	$	4,736	$	4,473	$	15,103	$	13,908
Income tax benefit from compensation expense related to stock options		1,169		1,123		3,727		3,492

Restricted stock [Member]

Share-Based Compensation and Benefit Plans

Summary of activity of share-based compensation and benefit plans

	For the Three Months Ended				For the Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Compensation expense for shares issued under the ESPP	$	832	$	717	$	2,264	$	2,060
Income tax benefit from compensation expense related to shares issued under the ESPP		205		180		559		517
Compensation expense for restricted shares awarded		401		392		1,177		1,094
Income tax benefit from compensation expense related to restricted awards	$	99	$	99	$	291	$	275