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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended
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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 |

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