STOCKHOLDERS' EQUITY - Stock Options (Details) - Stock Options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period (in shares)	867	858
Granted (in shares)	109	129
Exercised (in shares)	(8)	(34)
Forfeited (in shares)	0	(2)
Canceled (in shares)	0	(1)
Outstanding at end of period (in shares)	968	950
Exercisable at end of period (in shares)	676	604
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding at beginning of period (in dollars per share)	$ 88.19	$ 80.58
Granted (in dollars per share)	138.07	119.11
Exercised (in dollars per share)	63.52	70.53
Forfeited (in dollars per share)	0	101.38
Canceled (in dollars per share)	0	74.57
Outstanding at end of period (in dollars per share)	94.01	86.11
Exercisable at end of period (in dollars per share)	$ 81.06	$ 73.11
Aggregate intrinsic value, outstanding, beginning of period	$ 69,711	$ 29,735
Aggregate intrinsic value, outstanding, end of period	41,483	37,322
Aggregate intrinsic value, exercisable, end of period	$ 37,594	$ 31,603
Weighted average remaining contractual term, outstanding	6 years 7 months 6 days	7 years
Weighted average remaining contractual term, exercisable	5 years 7 months 6 days	5 years 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Dividend yield rate	0.50%	0.50%
Expected volatility rate	31.00%	33.00%
Risk-free interest rate	2.00%	0.50%
Expected term	4 years 10 months 24 days	4 years 10 months 24 days
Weighted-average fair value of options granted (in dollars per share)	$ 40.26	$ 33.10
Total intrinsic value of stock options exercised	$ 654	$ 1,917