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Fair Value Measurements (Details) (Fair value measured on a recurring basis, USD $) In Thousands, unless otherwise specified | Sep. 28, 2013 | Dec. 31, 2012 | Sep. 29, 2012
--- | --- | --- | ---
Estimated Fair Value |  |  |
Fair value measurements |  |  |
Cash and cash equivalents | $ 32,734 | $ 63,862 | $ 37,124
Auction rate security | 10,162 | 9,485 | 8,130
Available-for-sale securities excluding the auction rate security | 123,391 | 84,568 | 84,437
Trading securities | 58,968 | 49,378 | 48,382
Total assets measured at fair value | 225,381 | 207,181 | 178,221
Estimated Fair Value | Foreign currency forward contracts |  |  |
Fair value measurements |  |  |
Derivative instruments, net | 29 |  |
Estimated Fair Value | Commodity futures contracts, net |  |  |
Fair value measurements |  |  |
Derivative instruments, net | 97 | (112) | 48
Estimated Fair Value | Commodity option contracts |  |  |
Fair value measurements |  |  |
Derivative instruments, net |  |  | 100
Level 1 |  |  |
Fair value measurements |  |  |
Cash and cash equivalents | 32,734 | 63,862 | 37,124
Trading securities | 58,968 | 49,378 | 48,382
Total assets measured at fair value | 91,799 | 113,128 | 85,654
Level 1 | Commodity futures contracts, net |  |  |
Fair value measurements |  |  |
Derivative instruments, net | 97 | (112) | 48
Level 1 | Commodity option contracts |  |  |
Fair value measurements |  |  |
Derivative instruments, net |  |  | 100
Level 2 |  |  |
Fair value measurements |  |  |
Available-for-sale securities excluding the auction rate security | 123,391 | 84,568 | 84,437
Total assets measured at fair value | 123,420 | 84,568 | 84,437
Level 2 | Foreign currency forward contracts |  |  |
Fair value measurements |  |  |
Derivative instruments, net | 29 |  |
Level 3 |  |  |
Fair value measurements |  |  |
Auction rate security | 10,162 | 9,485 | 8,130
Total assets measured at fair value | $ 10,162 | $ 9,485 | $ 8,130

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- Definition This element represents the aggregate of the assets, including derivative assets (liabilities), net, at period end measured at fair value by the entity. For derivative instruments, the fair values as of the balance sheet date are the assets less any liabilities of a derivative or group of derivatives. + References No definition available. + Details
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- Definition This item represents the fair value of securities that are debt instruments (corporate or municipal bonds) that typically have long-term nominal maturities for which the interest rate is reset through an auction process, classified as Available-for-sale Securities. + References No definition available. + Details
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- Definition This item represents the fair value of investments in debt and equity securities classified as Available-for-sale Securities, excluding auction rate securities. + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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