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NET SALES - Disaggregate revenue by location (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of revenue:    
Net sales $ 78,375 $ 59,119
Domestic    
Disaggregation of revenue:    
Net sales 74,364 55,732
International    
Disaggregation of revenue:    
Net sales $ 4,011 $ 3,387