EMPLOYEE BENEFIT PLANS - Employee Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	520,998	912,531	1,960,992	2,262,743
% of all outstanding options	100.00%
% of Total	100.00%
Share price (in dollars per share)	$ 81.69
Stock Options | Current employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	296,916
% of Total	57.00%
Stock Options | Former employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	224,082
% of Total	43.00%
In-the-Money Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	520,998
% of all outstanding options	100.00%
% of Total	100.00%
In-the-Money Options | Current employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	296,916
% of Total	57.00%
In-the-Money Options | Former employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	224,082
% of Total	43.00%
Out-of-the-Money Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	0
% of all outstanding options	0.00%
% of Total	0.00%
Out-of-the-Money Options | Current employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	0
% of Total	0.00%
Out-of-the-Money Options | Former employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	0
% of Total	0.00%