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STOCK-BASED COMPENSATION - Compensation Expense (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Compensation expense | $ 21,579 | $ 16,353
Fair value of units vested | 20,778 | 10,696
Intrinsic value of units vested | 28,259 | 12,821
Options |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Compensation expense | 227 | 1,251
Compensation expense, net of tax | 174 | 951
Grant date fair value of options vested | 2,421 | 7,565
Options | Selling Research And Development And Administrative Expenses |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Compensation expense | 185 | 1,051
Options | Cost of Sales |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Compensation expense | $ 42 | $ 200

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