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Acquisition - Proforma Income Statement (Details) - Cedar Creek - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Net sales	$ 706,448	$ 948,555	$ 1,345,149	$ 1,732,822
Net income (loss)	$ 9,425	$ 9,180	$ 6,118	$ (1,439)
Earnings (loss) per common share:
Basic (in dollars per share)	$ 1.01	$ 1.00	$ 0.65	$ (0.16)
Diluted (in dollars per share)	$ 1.00	$ 0.98	$ 0.65	$ (0.16)

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