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Derivatives (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 29, 2019 | Mar. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 29, 2019 | Jun. 30, 2018 | Dec. 29, 2018
Derivative [Line Items] |  |  |  |  |  |  |
Net income/(loss) | $ 31,044,000 | $ 19,640,000 | $ (29,138,000) | $ 98,075,000 | $ 50,684,000 | $ 68,937,000 |
Commodity Contract [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Forward purchase amount | 37,800,000 |  |  |  | 37,800,000 |  |
Cash Flow Hedging [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Cash flow hedge gain (loss) to be reclassified within 12 months |  |  |  |  | 800,000 |  |
Net income/(loss) |  |  |  |  | 0 |  |
Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Foreign Exchange Contract [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Asset Derivatives Fair Value | 5,600,000 |  |  |  | 5,600,000 |  | $ 1,600,000
Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Corn Option [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Asset Derivatives Fair Value | $ 100,000 |  |  |  | $ 100,000 |  |

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