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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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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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