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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