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NET SALES - Timing of revenue recognition (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of revenue:    
Net sales $ 78,375 $ 59,119
Products transferred at point in time    
Disaggregation of revenue:    
Net sales 78,375 59,119
Products transferred over time    
Disaggregation of revenue:    
Net sales $ 0 $ 0