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STOCK-BASED COMPENSATION - Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restricted stock units |  |  |
STOCK-BASED COMPENSATION |  |  |
Compensation expense | $ 32,085 | $ 18,197 | $ 8,703
Fair value of units vested | 12,038 | 4,566 | 2,980
Intrinsic value of units vested | 14,446 | 5,360 | 3,708
Stock options |  |  |
STOCK-BASED COMPENSATION |  |  |
Compensation expense | 2,063 | 5,696 | 10,858
Compensation expense, net of tax | 1,573 | 4,507 | 8,391
Grant date fair value of options vested | 7,601 | 17,492 | 16,518
Stock options | Selling, research & development and administrative expenses |  |  |
STOCK-BASED COMPENSATION |  |  |
Compensation expense | 1,693 | 4,768 | 8,677
Stock options | Cost of sales |  |  |
STOCK-BASED COMPENSATION |  |  |
Compensation expense | $ 370 | $ 928 | $ 2,181

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