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Investments (Tables) | 9 Months Ended
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Sep. 28, 2013
Investments |
Summary of the amortized cost and estimated fair value of short-term investments for both available-for-sale and trading securities |
|  | 2013 |  | 2012 |
|  | Amortized |  | Fair |  | Amortized |  | Fair |
(Thousands of dollars) |  | Cost |  | Value |  | Cost |  | Value |
Money market funds |  | $ | 78,435 |  | $ | 78,435 |  | $ | 126,537 |  | $ | 126,537 |
Corporate bonds |  | 68,411 |  | 69,038 |  | 67,275 |  | 69,214 |
U.S. Government agency securities |  | 20,627 |  | 20,412 |  | 23,647 |  | 23,775 |
Emerging markets debt mutual fund |  | 17,693 |  | 17,253 |  | 17,693 |  | 18,734 |
Collateralized mortgage obligations |  | 15,058 |  | 15,007 |  | 15,059 |  | 15,162 |
Asset backed debt securities |  | 8,926 |  | 8,967 |  | 12,180 |  | 12,238 |
U.S. Treasury securities |  | 5,258 |  | 5,237 |  | 17,165 |  | 17,169 |
Total available-for-sale short-term investments |  | 214,408 |  | 214,349 |  | 279,556 |  | 282,829 |
High yield trading debt securities |  | 24,445 |  | 25,195 |  | 21,839 |  | 23,406 |
Emerging markets trading debt mutual fund |  | 3,161 |  | 2,900 |  | 3,046 |  | 3,237 |
Emerging markets trading debt securities |  | 1,493 |  | 1,535 |  | 2,361 |  | 2,600 |
Other trading investments |  | 974 |  | 1,016 |  | 1,262 |  | 1,307 |
Total available-for-sale and trading short-term investments |  | $ | 244,481 |  | $ | 244,995 |  | $ | 308,064 |  | $ | 313,379 |
Summary of estimated fair value of fixed rate securities designated as available-for-sale, classified by the contractual maturity date of the security |
(Thousands of dollars) |  | 2013 |
Due within one year |  | $ | 658 |
Due after one year through three years |  | 41,940 |
Due after three years |  | 57,131 |
Total fixed rate securities |  | $ | 99,729 |

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- Definition A table of investments, shown as a text block. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 6 -Section 10 -Paragraph (c) -Subparagraph (1) + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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