STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award
Proceeds from stock option exercises	$ 53,979	$ 51,098
Time-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)	3 years
RSU's granted (in shares)	143,807
RSU's vested (in shares)	220,723
Time-Based RSUs \| Director Stock Option Plans
Share-based Compensation Arrangement by Share-based Payment Award
RSU's granted (in shares)	10,007
RSU's vested (in shares)	12,379
Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)	3 years
RSU's granted (in shares)	169,974
RSU's vested (in shares)	72,139
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Tax benefit	$ 5,500
Unrecognized compensation expense	$ 50,900
Weighted-average period cost will be recognized over	1 year 10 months 24 days
Restricted Stock Units \| Director Stock Option Plans
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)	1 year
Options
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)	3 years
Tax benefit	$ 15,400	$ 10,800
Expiration period (in years)	10 years
Proceeds from stock option exercises	$ 54,000

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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