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Acquisition - Proforma Income Statement (Details) - Cedar Creek - 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]
Net sales	$ 859,776	$ 841,330	$ 2,592,597	$ 2,459,713
Net income (loss)	$ (6,219)	$ 8,033	$ (5,455)	$ (20,477)
Earnings (loss) per common share:
Basic (in dollars per share)	$ (0.67)	$ 0.88	$ (0.59)	$ (2.27)
Diluted (in dollars per share)	$ (0.67)	$ 0.87	$ (0.59)	$ (2.27)

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