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Acquisition Proforma Information (Details) - SPG - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Business Acquisition [Line Items]        
Net sales $ 405,404 $ 352,430 $ 803,955 $ 693,295
Net income $ 67,699 $ 43,336 $ 130,625 $ 60,865
Net income per common share - basic $ 0.48 $ 0.31 $ 0.92 $ 0.43
Net income per common share - diluted $ 0.47 $ 0.30 $ 0.91 $ 0.42