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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 28, 2013
Fair Value Measurements |
Schedule of financial assets and liabilities measured at fair value |
|  | Estimated Fair Value September 28, 2013 |
|  | Total |  | Input Levels Used |
|  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3 |
Cash and cash equivalents |  | $ | 32,734 |  | $ | 32,734 |  | $ | — |  | $ | — |
Auction rate security |  | 10,162 |  | — |  | — |  | 10,162 |
Available for sale securities excluding the auction rate security |  | 123,391 |  | — |  | 123,391 |  | — |
Foreign currency forward contracts |  | 29 |  | — |  | 29 |  | — |
Commodity futures contracts |  | 97 |  | 97 |  | — |  | — |
Trading securities |  | 58,968 |  | 58,968 |  | — |  | — |
Total assets measured at fair value |  | $ | 225,381 |  | $ | 91,799 |  | $ | 123,420 |  | $ | 10,162 |
|  | Estimated Fair Value December 31, 2012 |
|  | Total |  | Input Levels Used |
|  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3 |
Cash and cash equivalents |  | $ | 63,862 |  | $ | 63,862 |  | $ | — |  | $ | — |
Auction rate security |  | 9,485 |  | — |  | — |  | 9,485 |
Available for sale securities excluding the auction rate security |  | 84,568 |  | — |  | 84,568 |  | — |
Commodity futures contracts, net |  | (112 | ) | (112 | ) | — |  | — |
Trading securities |  | 49,378 |  | 49,378 |  | — |  | — |
Total assets measured at fair value |  | $ | 207,181 |  | $ | 113,128 |  | $ | 84,568 |  | $ | 9,485 |
|  | Estimated Fair Value September 29, 2012 |
|  | Total |  | Input Levels Used |
|  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3 |
Cash and cash equivalents |  | $ | 37,124 |  | $ | 37,124 |  | $ | — |  | $ | — |
Auction rate security |  | 8,130 |  | — |  | — |  | 8,130 |
Available for sale securities excluding the auction rate security |  | 84,437 |  | — |  | 84,437 |  | — |
Foreign currency forward contracts |  | — |  | — |  | — |  | — |
Commodity futures contracts |  | 48 |  | 48 |  | — |  | — |
Commodity options contracts |  | 100 |  | 100 |  | — |  | — |
Trading securities |  | 48,382 |  | 48,382 |  | — |  | — |
Total assets measured at fair value |  | $ | 178,221 |  | $ | 85,654 |  | $ | 84,437 |  | $ | 8,130 |
Schedule of financial instruments measured at fair value on a recurring basis using significant unobservable inputs (Level 3) |
|  | 2013 |  | 2012 |
Balance at January 1 |  | $ | 9,485 |  | $ | 7,453 |
Unrealized gain in other comprehensive earnings |  | 677 |  | 677 |
Balance at September 28 and September 29, respectively |  | $ | 10,162 |  | $ | 8,130 |

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19279-110258 Reference 2: 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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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant 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 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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