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NET SALES - Timing of revenue recognition (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of revenue:        
Net sales $ 40,818 $ 88,696 $ 99,937 $ 171,749
Products transferred at point in time        
Disaggregation of revenue:        
Net sales 40,818 88,696 99,937 171,749
Products transferred over time        
Disaggregation of revenue:        
Net sales $ 0 $ 0 $ 0 $ 0