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Investments (Tables) | 12 Months Ended
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Dec. 31, 2012
Investments |
Summary of the amortized cost and estimated fair value of short-term investments for both available-for-sale and trading securities |
|  | 2012 |  | 2011
|  | Amortized |  | Fair |  | Amortized |  | Fair
(Thousands of dollars) |  | Cost |  | Value |  | Cost |  | Value
Money market funds |  | $ | 126,537 |  | $ | 126,537 |  | $ | 139,420 |  | $ | 139,420
Corporate bonds |  | 67,275 |  | 69,214 |  | 88,589 |  | 89,146
U.S. Government agency securities |  | 23,647 |  | 23,775 |  | 9,720 |  | 9,757
Emerging markets debt mutual fund |  | 17,693 |  | 18,734 |  | 17,693 |  | 16,399
U.S. Treasury securities |  | 17,165 |  | 17,169 |  | 4,848 |  | 4,905
Collateralized mortgage obligations |  | 15,059 |  | 15,162 |  | 14,915 |  | 15,011
Asset backed debt securities |  | 12,180 |  | 12,238 |  | 3,533 |  | 3,533
Fixed rate municipal notes and bonds |  | - |  | - |  | 17,718 |  | 17,788
Other |  | - |  | - |  | 1,480 |  | 1,484
Total available-for-sale short-term investments |  | 279,556 |  | 282,829 |  | 297,916 |  | 297,443
High yield trading debt securities |  | 21,839 |  | 23,406 |  | 20,155 |  | 20,750
Emerging markets trading debt mutual funds |  | 3,046 |  | 3,237 |  | 2,620 |  | 2,487
Emerging markets trading debt securities |  | 2,361 |  | 2,600 |  | 2,444 |  | 2,355
Other trading investments |  | 1,262 |  | 1,307 |  | 218 |  | 221
Total short-term investments |  | $ | 308,064 |  | $ | 313,379 |  | $ | 323,353 |  | $ | 323,256
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) |  | 2012 |
Due within one year |  | $ 2,587 |
Due after one year through three years |  | 52,411 |
Due after three years |  | 60,721 |
Total fixed rate securities |  | $115,719 |

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