STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award
Proceeds from stock option exercises	$ 31,871	$ 18,602
Time-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)	3 years
RSU's granted (in shares)	128,297
RSU's vested (in shares)	118,349
Time-Based RSUs \| Director Stock Option Plans
Share-based Compensation Arrangement by Share-based Payment Award
RSU's granted (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)	169,268
RSU's vested (in shares)	71,994
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Tax benefit	$ 2,100
Unrecognized compensation expense	$ 69,900
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	$ 9,100	$ 4,800
Expiration period	10 years
Proceeds from stock option exercises	$ 31,900

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

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