STOCK-BASED COMPENSATION - Summary of Option Activity (Details) - Options - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock Awards Plans
Stock options activity
Outstanding at the beginning of the period (in shares)	3,998,047
Granted (in shares)	0
Exercised (in shares)	(915,391)
Forfeited or expired (in shares)	(10,153)
Outstanding at the end of the period (in shares)	3,072,503	3,998,047
Stock option weighted average exercise price
Outstanding at the beginning of the period (in dollars per share)	$ 70.28
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)	64.48
Options forfeited or expired, Weighted average exercise price per share (in dollars per share)	75.46
Outstanding at the end of the period (in dollars per share)	$ 71.99	$ 70.28
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options exercisable, Number of options (in shares)	3,072,503
Options exercisable, Weighted average exercise price per share (in dollars per share)	$ 71.99
Options outstanding, Weighted average remaining contractual term (in years)	4 years 1 month 6 days
Options exercisable, Weighted average remaining contractual term (in years)	4 years 1 month 6 days
Options outstanding, Aggregate intrinsic value (in USD)	$ 155,138
Options exercisable, Aggregate intrinsic value (in USD)	155,138
Options exercised, Intrinsic value, at end of period	$ 69,862	$ 59,179	$ 87,251
Director Stock Option Plans
Stock options activity
Outstanding at the beginning of the period (in shares)	99,200
Granted (in shares)	0
Exercised (in shares)	(47,500)
Forfeited or expired (in shares)	0
Outstanding at the end of the period (in shares)	51,700	99,200
Stock option weighted average exercise price
Outstanding at the beginning of the period (in dollars per share)	$ 60.80
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)	57.40
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	$ 60.80
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)	2 years 1 month 6 days
Options exercisable, Weighted average remaining contractual term (in years)	2 years 1 month 6 days
Options outstanding, Aggregate intrinsic value (in USD)	$ 3,028
Options exercisable, Aggregate intrinsic value (in USD)	3,028
Options exercised, Intrinsic value, at end of period	$ 4,248	$ 2,318	$ 1,172