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Investments | 3 Months Ended
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Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
Investments | Investments 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 March 31, 2016 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. government securities funds | $ | 1,794 |  |  | $ | — |  |  | $ | (3 | ) |  | $ | 1,791 |
Total short-term investment securities | $ | 1,794 |  |  | $ | — |  |  | $ | (3 | ) |  | $ | 1,791 |
As of December 31, 2015 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. government securities funds | $ | 1,794 |  |  | $ | — |  |  | $ | (22 | ) |  | $ | 1,772 |
Total short-term investment securities | $ | 1,794 |  |  | $ | — |  |  | $ | (22 | ) |  | $ | 1,772 |
There were no proceeds from the sales of available-for-sale securities during the three-month periods ended March 31, 2016 and 2015. The Company’s trading securities portfolio totaled $1.2 million at March 31, 2016, and $1.0 million at December 31, 2015, and generated gains of $7,000 and $23,000 for the three months ended March 31, 2016 and 2015, respectively. As of March 31, 2016 and December 31, 2015, the Company had unrealized losses of $3,000 and $22,000, 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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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27405-111563 + Details
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