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Investments | 9 Months Ended
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Sep. 30, 2015
Investments |
Investments | (6)Investments The amortized cost and estimated fair values of available-for-sale securities by balance sheet classification are as follows:
As of September 30, 2015 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
U.S. government securities funds |  | $ | 1,791 |  | $ | — |  | $ | (5 | ) | $ | 1,786 |
Total short-term investment securities |  | $ | 1,791 |  | $ | — |  | $ | (5 | ) | $ | 1,786 |
As of December 31, 2014 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Municipal obligations |  | $ | 100 |  | $ | 1 |  | $ | — |  | $ | 101 |
U.S. government securities funds |  | 1,791 |  | — |  | (15 | ) | 1,776 |
Equity securities |  | 227 |  | 454 |  | (12 | ) | 669 |
Total short-term investment securities |  | $ | 2,118 |  | $ | 455 |  | $ | (27 | ) | $ | 2,546 |
During the nine-month period ended September 30, 2015, and 2014, the proceeds from the sales of available-for-sale securities were $810 and $51, respectively. During the nine-month period ended September 30, 2015, the Company had gross realized gains of $294 on sales of available-for-sale securities (net of tax). There were no gross realized gains (losses) on sales of available-for-sale securities (net of tax) for the nine-month period ended September 30, 2014. The Company’s trading securities portfolio totaled $992 at September 30, 2015, and $1,038 at December 31, 2014, and generated losses of $37 and gains of $44 for the nine months ended September 30, 2015, and 2014. As of September 30, 2015, and December 31, 2014, the Company had unrealized losses of $5 and $15, respectively, in its U.S. government securities funds.

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