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STOCK-BASED COMPENSATION - Compensation Expense (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Compensation expense | $ 29,493 | $ 24,497
Fair value of units vested | 29,671 | 11,188
Intrinsic value of units vested | 39,752 | 13,475
Options |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Compensation expense | 227 | 1,694
Compensation expense, net of tax | 174 | 1,289
Grant date fair value of options vested | 2,421 | 7,601
Options | Selling Research And Development And Administrative Expenses |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Compensation expense | 185 | 1,409
Options | Cost of Sales |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Compensation expense | $ 42 | $ 285

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