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NET SALES - Timing of revenue recognition (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of revenue:        
Net sales $ 68,778 $ 72,212 $ 168,715 $ 243,961
Products transferred at point in time        
Disaggregation of revenue:        
Net sales 68,778 72,212 168,715 243,961
Products transferred over time        
Disaggregation of revenue:        
Net sales $ 0 $ 0 $ 0 $ 0