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STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award |  |
Proceeds from stock option exercises | $ 51,098 | $ 81,815
Time-Based RSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Vesting period (in years) | 3 years |
RSU's granted (in shares) | 232,802 |
RSU's vested (in shares) | 130,654 |
Time-Based RSUs | Director Stock Option Plans |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
RSU's granted (in shares) | 12,379 |
RSU's vested (in shares) | 11,490 |
Performance-Based RSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Vesting period (in years) | 3 years |
RSU's granted (in shares) | 417,313 |
RSU's vested (in shares) | 0 |
Restricted stock |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Compensation expense | $ 24,500 | 13,700
Tax benefit | 4,500 |
Fair value of units vested | 11,200 | 4,100
Intrinsic value of units vested | 13,500 | 4,900
Unrecognized compensation expense | $ 51,100 |
Weighted-average period cost will be recognized over | 2 years |
Restricted stock | Director Stock Option Plans |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Vesting period (in years) | 1 year |
Stock options |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Vesting period (in years) | 3 years |
Compensation expense | $ 1,700 | 4,400
Tax benefit | 10,800 |
Unrecognized compensation expense | $ 600 |
Weighted-average period cost will be recognized over | 4 months 24 days |
Expiration period | 10 years |
Compensation expense, after tax | $ 1,300 | 3,600
Grant date fair value of options | 7,600 | 12,200
Proceeds from stock option exercises | 51,100 |
Stock options | Selling Research And Development And Administrative Expenses |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Compensation expense | $ 1,400 | $ 3,700

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