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Investments (Tables) | 6 Months Ended
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Jun. 28, 2014
Investments |
Summary of the amortized cost and estimated fair value of short-term investments for both available-for-sale and trading securities | The following is a summary of the amortized cost and estimated fair value of short-term investments for both available-for-sale and trading securities at June 28, 2014 and December 31, 2013.
|  | 2014 |  | 2013 |
|  | Amortized |  | Fair |  | Amortized |  | Fair |
(Thousands of dollars) |  | Cost |  | Value |  | Cost |  | Value |
Money market funds |  | $ | 66,993 |  | $ | 66,993 |  | $ | 88,430 |  | $ | 88,430 |
Corporate bonds |  | 49,306 |  | 49,921 |  | 69,591 |  | 70,258 |
U.S. Government agency securities |  | 43,615 |  | 43,629 |  | 27,299 |  | 27,147 |
Asset backed debt securities |  | 10,791 |  | 10,791 |  | 8,446 |  | 8,477 |
Collateralized mortgage obligations |  | 5,575 |  | 5,584 |  | 7,597 |  | 7,600 |
U.S. Treasury securities |  | 5,039 |  | 5,035 |  | 5,258 |  | 5,223 |
Emerging markets debt mutual fund |  | - |  | - |  | 17,693 |  | 16,941 |
Total available-for-sale short-term investments |  | 181,319 |  | 181,953 |  | 224,314 |  | 224,076 |
High yield trading debt securities |  | 101,802 |  | 103,163 |  | 49,352 |  | 50,428 |
Equity mutual fund |  | 25,087 |  | 25,017 |  | - |  | - |
Money market funds held in trading accounts |  | 5,728 |  | 5,728 |  | 11,033 |  | 11,033 |
Domestic equity ETF |  | 4,853 |  | 5,107 |  | - |  | - |
Emerging markets trading debt mutual fund |  | 3,282 |  | 2,988 |  | 3,202 |  | 2,858 |
Emerging markets trading debt securities |  | 605 |  | 621 |  | 1,300 |  | 1,336 |
Other trading investments |  | 505 |  | 557 |  | 841 |  | 918 |
Total available-for-sale and trading short-term investments |  | $ | 323,181 |  | $ | 325,134 |  | $ | 290,042 |  | $ | 290,649 |
Summary of estimated fair value of fixed rate securities designated as available-for-sale, classified by the contractual maturity date of the security | The following table summarizes the estimated fair value of fixed rate securities designated as available-for-sale classified by the contractual maturity date of the security as of June 28, 2014.
(Thousands of dollars) |  | 2014 |
Due within one year |  | $ | 1,963 |
Due after one year through three years |  | 45,889 |
Due after three years |  | 49,675 |
Total fixed rate securities |  | $ | 97,527 |

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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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