Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - CSC Pro-forma Summary (Details)

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Acquisitions - CSC Pro-forma Summary (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Business Acquisition [Line Items]        
Sales $ 212,674 $ 149,636 $ 600,339 $ 453,146
Net Income $ 16,999 $ 6,060 $ 34,318 $ 25,332
Basic (in usd per share) $ 0.53 $ 0.19 $ 1.06 $ 0.77
Diluted (in usd per share) $ 0.52 $ 0.18 $ 1.04 $ 0.74
Pro Forma        
Business Acquisition [Line Items]        
Sales   $ 166,789   $ 499,958
Net Income   $ 5,941   $ 24,173
Basic (in usd per share)   $ 0.18   $ 0.73
Diluted (in usd per share)   $ 0.18   $ 0.71