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Acquisition - Proforma Income Statement (Details) - Cedar Creek - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Business Acquisition [Line Items]
Net sales	$ 358,100	$ 948,555	$ 848,644	$ 1,732,822	$ 1,618,383
Net income (loss)	$ 1,200	$ 9,180	$ 5,963	$ (1,439)	$ (30,290)
Earnings (loss) per common share:
Basic (in dollars per share)		$ 1.00	$ 0.66	$ (0.16)	$ (3.36)
Diluted (in dollars per share)		$ 0.98	$ 0.65	$ (0.16)	$ (3.36)

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