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Acquisitions (Pro Forma Information) (Details) - Rough Brothers Incorporated - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]    
Net sales $ 1,128,915 $ 1,026,014
Net income (loss) $ 33,587 $ (46,714)
Net income (loss) per share - Basic $ 1.08 $ (1.50)
Net income (loss) per share - Diluted $ 1.06 $ (1.50)