STOCK-BASED COMPENSATION - Summary of Option Activity (Details) - Options - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Stock Awards Plans
Stock options activity
Outstanding at the beginning of the period (in shares)	3,072,503
Exercised (in shares)	(61,775)
Forfeited or expired (in shares)	(400)
Outstanding at the end of the period (in shares)	3,010,328
Stock option weighted average exercise price
Outstanding at the beginning of the period (in dollars per share)	$ 71.99
Options exercised, Weighted average exercise price per share (in dollars per share)	59.68
Options forfeited or expired, Weighted average exercise price per share (in dollars per share)	51.80
Outstanding at the end of the period (in dollars per share)	$ 72.24
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options exercisable, Number of options (in shares)	3,010,328
Options exercisable, Weighted average exercise price per share (in dollars per share)	$ 72.24
Options outstanding, Weighted average remaining contractual term (in years)	3 years 10 months 24 days
Options exercisable, Weighted average remaining contractual term (in years)	3 years 10 months 24 days
Options outstanding, Aggregate intrinsic value (in USD)	$ 136,239
Options exercisable, Aggregate intrinsic value (in USD)	136,239
Options exercised, Intrinsic value, at end of period	$ 3,780	$ 37,454
Director Stock Option Plans
Stock options activity
Outstanding at the beginning of the period (in shares)	51,700
Exercised (in shares)	0
Forfeited or expired (in shares)	0
Outstanding at the end of the period (in shares)	51,700
Stock option weighted average exercise price
Outstanding at the beginning of the period (in dollars per share)	$ 63.91
Options exercised, Weighted average exercise price per share (in dollars per share)	0
Options forfeited or expired, Weighted average exercise price per share (in dollars per share)	0
Outstanding at the end of the period (in dollars per share)	$ 63.91
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options exercisable, Number of options (in shares)	51,700
Options exercisable, Weighted average exercise price per share (in dollars per share)	$ 63.91
Options outstanding, Weighted average remaining contractual term (in years)	1 year 9 months 18 days
Options exercisable, Weighted average remaining contractual term (in years)	1 year 9 months 18 days
Options outstanding, Aggregate intrinsic value (in USD)	$ 2,770
Options exercisable, Aggregate intrinsic value (in USD)	2,770
Options exercised, Intrinsic value, at end of period	$ 0	$ 2,474