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ACQUISITIONS - Summary of Pro Forma Consolidated Net Sales and Income (Loss) Before Income Taxes and Equity in Earnings (Details) - Filament - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]    
Net sales $ 730,353 $ 747,549
Income before income taxes and equity in earnings 2,439 14,151
Net (loss) income $ (267) $ 5,794
Basic and diluted (loss) income per common share $ (0.01) $ 0.28