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Derivatives (Narrative) (Details) - USD ($) | 3 Months Ended
--- | ---
Apr. 01, 2017 | Apr. 02, 2016
Derivative [Line Items] |  |
Net income | $ 7,398,000 | $ 2,663,000
Commodity Contract [Member] |  |
Derivative [Line Items] |  |
Forward purchase amount | 23,700,000 |
Cash Flow Hedging [Member] |  |
Derivative [Line Items] |  |
Cash flow hedge gain (loss) to be reclassified within 12 months | 2,200,000 |
Net income | $ 0 |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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