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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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