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Investments | 6 Months Ended
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Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract] |
Investments | Investments As of June 30, 2017, the Company had no investments available for sale. Proceeds from the sale of available-for-sale investments were $1.8 million during the six-month period ended June 30, 2017. The amortized cost and estimated fair values of available-for-sale securities by balance sheet classification are as follows (dollar amounts in thousands):
As of December 31, 2016 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. government securities funds | $ | 1,799 |  |  | $ | — |  |  | $ | (23 | ) |  | $ | 1,776 |
Total short-term investment securities | $ | 1,799 |  |  | $ | — |  |  | $ | (23 | ) |  | $ | 1,776 |
There were no proceeds from the sale of investments during the six-months ended June 30, 2016. The Company’s trading securities portfolio totaled $1.8 million at June 30, 2017, and $1.4 million at December 31, 2016, and generated gains of $51,000 and $28,000 for the three months ended and $102,000 and $35,000 for the six months ended June 30, 2017 and 2016, respectively. As of June 30, 2017, and December 31, 2016, the Company had an unrealized loss of $0 and $23,000, respectively, in its U.S. government securities funds. There were no securities that were in a loss position for more than 12 months.

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