STOCK-BASED COMPENSATION - Summary of Option Activity (Details) - Stock options - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Stock Awards Plans
Assumptions used to estimate fair value of stock options granted
Dividend yield assumption	1.41%
Expected Stock Price Volatility	16.55%
Risk-free interest rate	3.57%
Expected Life of Option (years)	7 years
Stock options activity
Outstanding at the beginning of the period (in shares)	2,623,944
Granted (in shares)	314,833
Exercised (in shares)	(545,104)
Forfeited or expired (in shares)	(4,130)
Outstanding at the end of the period (in shares)	2,389,543
Stock option weighted average exercise price
Outstanding at the beginning of the period (in dollars per share)	$ 73.34
Options granted, Weighted average exercise price per share (in dollars per share)	116.20
Options exercised, Weighted average exercise price per share (in dollars per share)	69.30
Options forfeited or expired, Weighted average exercise price per share (in dollars per share)	83.84
Outstanding at the end of the period (in dollars per share)	$ 79.89
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options exercisable, Number of options (in shares)	2,075,973
Options exercisable, Weighted average exercise price per share (in dollars per share)	$ 74.40
Options outstanding, Weighted average remaining contractual term (in years)	3 years 8 months 12 days
Options exercisable, Weighted average remaining contractual term (in years)	2 years 9 months 18 days
Options outstanding, Aggregate intrinsic value (in USD)	$ 108,471
Options exercisable, Aggregate intrinsic value (in USD)	105,629
Options exercised, Intrinsic value, at end of period	$ 27,392	$ 13,618
Director Stock Option Plans
Stock options activity
Outstanding at the beginning of the period (in shares)	51,700
Granted (in shares)	0
Exercised (in shares)	(32,700)
Forfeited or expired (in shares)	0
Outstanding at the end of the period (in shares)	19,000
Stock option weighted average exercise price
Outstanding at the beginning of the period (in dollars per share)	$ 63.91
Options granted, Weighted average exercise price per share (in dollars per share)	0
Options exercised, Weighted average exercise price per share (in dollars per share)	62.36
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)	$ 66.59
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options exercisable, Number of options (in shares)	19,000
Options exercisable, Weighted average exercise price per share (in dollars per share)	$ 66.59
Options outstanding, Weighted average remaining contractual term (in years)	7 months 6 days
Options exercisable, Weighted average remaining contractual term (in years)	7 months 6 days
Options outstanding, Aggregate intrinsic value (in USD)	$ 1,115
Options exercisable, Aggregate intrinsic value (in USD)	1,115
Options exercised, Intrinsic value, at end of period	$ 1,978	$ 0