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NET SALES - Timing of revenue recognition (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of revenue:        
Net sales $ 88,696 $ 87,006 $ 171,749 $ 164,542
Products transferred at point in time        
Disaggregation of revenue:        
Net sales 88,696 87,006 171,749 164,542
Products transferred over time        
Disaggregation of revenue:        
Net sales $ 0 $ 0 $ 0 $ 0