STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award
Proceeds from stock option exercises	$ 53,038	$ 30,058
Time-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)	3 years
RSU's granted (in shares)	140,316
RSU's vested (in shares)	134,808
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)	71,994
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Tax benefit	$ 4,000
Unrecognized compensation expense	$ 61,300
Weighted-average period cost will be recognized over	2 years
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	$ 15,000	$ 6,400
Expiration period	10 years
Proceeds from stock option exercises	$ 53,000

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

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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