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Fair Value Measurements (Details 4) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  |  |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 28, 2013 | Dec. 31, 2012 | Sep. 29, 2012 | Sep. 28, 2013 Cost Basis Level 2 | Sep. 29, 2012 Cost Basis Level 2 | Sep. 28, 2013 Estimated Fair Value Level 2 | Sep. 29, 2012 Estimated Fair Value Level 2 | Sep. 28, 2013 Auction rate security Level 3 | Sep. 29, 2012 Auction rate security Level 3
Level 3 reconciliation |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  |  |  |  | $ 9,485 | $ 7,453
Unrealized gain in other comprehensive earnings |  |  |  |  |  |  |  | 677 | 677
Balance at the end of the period |  |  |  |  |  |  |  | 10,162 | 8,130
Industrial revenue development bonds, carrying amount, approximates fair value | $ 7,500 | $ 7,500 | $ 7,500 | $ 7,500 | $ 7,500 | $ 7,500 | $ 7,500 |  |

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- Definition This element represents amount due for industrial development bonds carrying average floating interest rate. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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