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Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2012 | Jul. 03, 2011 | Jul. 01, 2012 | Jul. 03, 2011
Summary of net gains and losses |  |  |  |
Total Net Gain (Loss) | $ 0 | $ (1,055) | $ 0 | $ (1,017)
Fuel hedges [Member] | Contract premium and contract settlement [Member] | S,D&A expenses [Member] |  |  |  |
Summary of net gains and losses |  |  |  |
Total Net Gain (Loss) | 0 | (105) | 0 | 66
Fuel hedges [Member] | Mark-to-market adjustment [Member] | S,D&A expenses [Member] |  |  |  |
Summary of net gains and losses |  |  |  |
Total Net Gain (Loss) | 0 | (25) | 0 | (171)
Aluminum hedges [Member] | Contract premium and contract settlement [Member] | Cost of sales [Member] |  |  |  |
Summary of net gains and losses |  |  |  |
Total Net Gain (Loss) | 0 | 783 | 0 | 1,304
Aluminum hedges [Member] | Mark-to-market adjustment [Member] | Cost of sales [Member] |  |  |  |
Summary of net gains and losses |  |  |  |
Total Net Gain (Loss) | $ 0 | $ (1,708) | $ 0 | $ (2,216)

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- Definition The amount of gain recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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