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Investments (Tables) | 12 Months Ended
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Dec. 31, 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 |  | $ 88,430 |  | $ 88,430 |  | $ 126,537 |  | $ 126,537 |
Corporate bonds |  | 69,591 |  | 70,258 |  | 67,275 |  | 69,214 |
U.S. Government agency securities |  | 27,299 |  | 27,147 |  | 23,647 |  | 23,775 |
Emerging markets debt mutual fund |  | 17,693 |  | 16,941 |  | 17,693 |  | 18,734 |
Asset backed debt securities |  | 8,446 |  | 8,477 |  | 12,180 |  | 12,238 |
Collateralized mortgage obligations |  | 7,597 |  | 7,600 |  | 15,059 |  | 15,162 |
U.S. Treasury securities |  | 5,258 |  | 5,223 |  | 17,165 |  | 17,169 |
Total available-for-sale short-term investments |  | 224,314 |  | 224,076 |  | 279,556 |  | 282,829 |
High yield trading debt securities |  | 49,352 |  | 50,428 |  | 21,839 |  | 23,406 |
Money market funds held in trading accounts |  | 11,033 |  | 11,033 |  | - |  | - |
Emerging markets trading debt mutual fund |  | 3,202 |  | 2,858 |  | 3,046 |  | 3,237 |
Emerging markets trading debt securities |  | 1,300 |  | 1,336 |  | 2,361 |  | 2,600 |
Other trading investments |  | 841 |  | 918 |  | 1,262 |  | 1,307 |
Total short-term investments |  | $ 290,042 |  | $ 290,649 |  | $ 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 |  | $ 4,605 |
Due after one year through three years |  | 37,111 |
Due after three years |  | 58,768 |
Total fixed rate securities |  | $100,484 |

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