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Investments (Tables) | 3 Months Ended
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Mar. 30, 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 |  | $ | 138,756 |  | $ | 138,756 |  | $ | 126,537 |  | $ | 126,537 |
Corporate bonds |  | 65,071 |  | 66,661 |  | 67,275 |  | 69,214 |
Enhanced cash mutual fund |  | 25,000 |  | 25,011 |  | - |  | - |
U.S. Government agency securities |  | 22,276 |  | 22,336 |  | 23,647 |  | 23,775 |
U.S. Treasury securities |  | 20,821 |  | 20,855 |  | 17,165 |  | 17,169 |
Emerging markets debt mutual fund |  | 17,693 |  | 18,750 |  | 17,693 |  | 18,734 |
Collateralized mortgage obligations |  | 14,622 |  | 14,716 |  | 15,059 |  | 15,162 |
Asset backed debt securities |  | 12,485 |  | 12,544 |  | 12,180 |  | 12,238 |
Total available-for-sale short-term investments |  | 316,724 |  | 319,629 |  | 279,556 |  | 282,829 |
High yield trading debt securities |  | 22,604 |  | 24,190 |  | 21,839 |  | 23,406 |
Emerging markets trading debt mutual fund |  | 3,079 |  | 3,237 |  | 3,046 |  | 3,237 |
Emerging markets trading debt securities |  | 2,563 |  | 2,761 |  | 2,361 |  | 2,600 |
Other trading investments |  | 935 |  | 985 |  | 1,262 |  | 1,307 |
Total available-for-sale and trading short-term investments |  | $ | 345,905 |  | $ | 350,802 |  | $ | 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 |  | $ | 4,254 |
Due after one year through three years |  | 42,457 |
Due after three years |  | 63,702 |
Total fixed rate securities |  | $ | 110,413 |

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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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