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NET SALES (Timing of revenue recognition) (Details 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Net sales $ 72,012 $ 59,201 $ 236,554 $ 201,725
Products transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Net sales 72,012 59,201 236,554 201,725
Products transferred over time        
Disaggregation of Revenue [Line Items]        
Net sales $ 0 $ 0 $ 0 $ 0