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Investments | 6 Months Ended
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Jun. 30, 2014
Investments |
Investments | (4)Investments The amortized cost and estimated fair values of available-for-sale securities by balance sheet classification are as follows:
As of June 30, 2014 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Municipal obligations |  | $ | 401 |  | $ | 5 |  | $ | — |  | $ | 406 |
U.S. government securities funds |  | 998 |  | — |  | (11 | ) | 987 |
Equity securities |  | 227 |  | 412 |  | (8 | ) | 631 |
Total short-term investment securities |  | $ | 1,626 |  | $ | 417 |  | $ | (19 | ) | $ | 2,024 |
As of December 31, 2013 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Municipal obligations |  | $ | 403 |  | $ | 12 |  | $ | — |  | $ | 415 |
U.S. government securities funds |  | 997 |  | — |  | (14 | ) | 983 |
Equity securities |  | 227 |  | 386 |  | (5 | ) | 608 |
Total short-term investment securities |  | $ | 1,627 |  | $ | 398 |  | $ | (19 | ) | $ | 2,006 |
The municipal obligations held at a fair value of $406 at June 30, 2014, all mature in less than two years. During the six-month periods ended June 30, 2014 and 2013, the proceeds from the sales of available-for-sale securities were $51 and $0, respectively. There were no gross realized gains (losses) on sales of available-for-sale securities (net of tax) for the six-month periods ended June 30, 2014 and 2013, respectively. The Company’s trading securities portfolio totaled $1,022 at June 30, 2014, and $971 at December 31, 2013, and generated gains of $44 and $33 for the six months ended June 30, 2014 and 2013. As of June 30, 2014 and December 31, 2013, the Company had unrealized losses of $11 and $14, respectively, in its U.S. government securities funds. These losses are due to the interest rate sensitivity of the municipal obligations and the performance of the overall stock market for the equity securities.

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