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Investments (Tables) | 6 Months Ended
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Jun. 30, 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 |
Corporate bonds |  | $ | 134,965 |  | $ | 136,258 |  | $ | 88,589 |  | $ | 89,146 |
Money market funds and deposit accounts |  | 101,011 |  | 101,011 |  | 139,420 |  | 139,420 |
Enhanced cash mutual fund |  | 50,000 |  | 50,072 |  | - |  | - |
Collateralized mortgage obligations |  | 24,859 |  | 24,944 |  | 14,915 |  | 15,011 |
Fixed rate municipal notes and bonds |  | 23,553 |  | 23,592 |  | 17,718 |  | 17,788 |
U.S. Government agency securities |  | 22,424 |  | 22,572 |  | 9,720 |  | 9,757 |
U.S. Treasury securities |  | 20,458 |  | 20,526 |  | 4,848 |  | 4,905 |
Emerging markets debt mutual fund |  | 17,693 |  | 17,035 |  | 17,693 |  | 16,399 |
Asset backed debt securities |  | 15,499 |  | 15,514 |  | 3,533 |  | 3,533 |
Other |  | 680 |  | 683 |  | 1,480 |  | 1,484 |
Total available-for-sale short-term investments |  | 411,142 |  | 412,207 |  | 297,916 |  | 297,443 |
High yield trading debt securities |  | 21,129 |  | 22,084 |  | 20,155 |  | 20,750 |
Emerging markets trading debt mutual fund |  | 2,966 |  | 2,919 |  | 2,620 |  | 2,487 |
Emerging markets trading debt securities |  | 2,004 |  | 2,073 |  | 2,444 |  | 2,355 |
Other trading debt securities |  | 684 |  | 754 |  | 218 |  | 221 |
Total available-for-sale and trading short-term investments |  | $ | 437,925 |  | $ | 440,037 |  | $ | 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 |  | $ | 44,983 |
Due after one year through three years |  | 88,072 |
Due after three years |  | 67,516 |
Total fixed rate securities |  | $ | 200,571 |

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