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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended
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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 |

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