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Fair Value Measurements (Details 4) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 29, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Jun. 29, 2013 Cost Basis Level 2 | Jun. 30, 2012 Cost Basis Level 2 | Jun. 29, 2013 Estimated Fair Value Level 2 | Jun. 30, 2012 Estimated Fair Value Level 2 | Jun. 29, 2013 Auction rate security Level 3 | Jun. 30, 2012 Auction rate security Level 3 | Dec. 31, 2011 Auction rate security Level 3
Level 3 reconciliation |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  |  |  |  | $ 9,485 | $ 7,453 | $ 7,453
Unrealized loss in other comprehensive earnings |  |  |  |  |  |  |  | 677 |  |
Balance at the end of the period |  |  |  |  |  |  |  | 10,162 | 7,453 | 7,453
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, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3). + 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=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + 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=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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