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STOCK-BASED COMPENSATION - Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Options    
Share-based Compensation Arrangement by Share-based Payment Award    
Compensation expense $ 227 $ 860
Compensation expense, net of tax 174 648
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 185 743
Options | Cost of Sales    
Share-based Compensation Arrangement by Share-based Payment Award    
Compensation expense 42 117
Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award    
Compensation expense 11,262 8,281
Fair value of units vested 19,116 9,303
Intrinsic value of units vested $ 25,699 $ 11,475