SHARE-BASED COMPENSATION AND BENEFIT PLANS (Tables)

6 Months Ended

Jun. 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	110		467.05
Exercised	(206)		163.63
Forfeited or expired	(9)		337.54
Outstanding at June 30, 2021	1,395	$	277.79
Exercisable at June 30, 2021	959	$	229.94

Black-Scholes option pricing model

	June 30,
	2021		2020
Risk free interest rate	0.83	%	0.96	%
Expected life	6.2	Years	6.2	Years
Expected volatility	30.0	%	25.8	%
Expected dividend yield	—	%	—	%

Summary of activity of share-based compensation and benefit plans

	For the Three Months Ended				For the Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
Compensation expense for stock options awarded	$	5,105	$	4,557	$	10,367	$	9,435
Income tax benefit from compensation expense related to stock options		1,314		1,148		2,668		2,377

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 Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
Compensation expense for shares issued under the ESPP	$	782	$	697	$	1,432	$	1,343
Income tax benefit from compensation expense related to shares issued under the ESPP		201		176		368		338
Compensation expense for restricted shares awarded		396		351		776		702
Income tax benefit from compensation expense related to restricted awards	$	102	$	88	$	200	$	177