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NET SALES (Timing of revenue recognition) (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Net sales $ 87,006 $ 71,484 $ 164,542 $ 142,524
Products transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Net sales 87,006 71,484 164,542 142,524
Products transferred over time        
Disaggregation of Revenue [Line Items]        
Net sales $ 0 $ 0 $ 0 $ 0