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Investments (Tables) | 12 Months Ended
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Dec. 31, 2014
Investments |
Summary of the amortized cost and estimated fair value of short-term investments for both available-for-sale and trading securities |
|  | 2014 |  | 2013 |
|  | Amortized |  | Fair |  | Amortized |  | Fair |
(Thousands of dollars) |  | Cost |  | Value |  | Cost |  | Value |
Money market funds |  | $ | 142,432 |  | $ | 142,432 |  | $ | 88,430 |  | $ | 88,430 |
Corporate bonds |  | 11,000 |  | 11,015 |  | 69,591 |  | 70,258 |
U.S. Government agency securities |  | 9,684 |  | 9,666 |  | 27,299 |  | 27,147 |
Asset backed debt securities |  | 2,260 |  | 2,291 |  | 8,446 |  | 8,477 |
Collateralized mortgage obligations |  | 1,150 |  | 1,170 |  | 7,597 |  | 7,600 |
U.S. Treasury securities |  | 523 |  | 522 |  | 5,258 |  | 5,223 |
Emerging markets debt mutual fund |  | - |  | - |  | 17,693 |  | 16,941 |
Total available-for-sale short-term investments |  | 167,049 |  | 167,096 |  | 224,314 |  | 224,076 |
High yield trading debt securities |  | 187,491 |  | 181,483 |  | 49,352 |  | 50,428 |
Equity mutual fund |  | 83,809 |  | 82,542 |  | - |  | - |
Domestic equity ETF |  | 31,307 |  | 32,651 |  | - |  | - |
Money market funds held in trading accounts |  | 21,401 |  | 21,401 |  | 11,033 |  | 11,033 |
Emerging markets trading debt mutual fund |  | 3,323 |  | 2,614 |  | 3,202 |  | 2,858 |
Other trading investments |  | 2,850 |  | 2,779 |  | 2,141 |  | 2,254 |
Total trading short-term investments |  | 330,181 |  | 323,470 |  | 65,728 |  | 66,573 |
Total short-term investments |  | $ | 497,230 |  | $ | 490,566 |  | $ | 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 |
(Thousands of dollars) |  | 2014 |
Due within one year |  | $ | 546 |
Due after one year through three years |  | 9,956 |
Due after three years |  | 11,105 |
Total fixed rate securities |  | $ | 21,607 |

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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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