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Investments | 9 Months Ended
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Sep. 30, 2012
Investments |
Investments |
(4) Investments The amortized cost and estimated fair values of available-for-sale securities by investment category are as follows:
As of September 30, 2012 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Municipal obligations |  | $ | 709 |  | $ | 36 |  | $ | — |  | $ | 745 |
U.S. government securities funds |  | 990 |  | — |  | (4 | ) | 986 |
Equity securities |  | 227 |  | 240 |  | (6 | ) | 461 |
Total short-term investment securities |  | $ | 1,926 |  | $ | 276 |  | $ | (10 | ) | $ | 2,192 |
As of December 31, 2011 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Municipal obligations |  | $ | 1,158 |  | $ | 51 |  | $ | — |  | $ | 1,209 |
U.S. government securities funds |  | 988 |  | — |  | (5 | ) | 983 |
Short-term deposits |  | 3,104 |  | — |  | — |  | 3,104 |
Equity securities |  | 227 |  | 159 |  | (5 | ) | 381 |
Total short-term investment securities |  | $ | 5,477 |  | $ | 210 |  | $ | (10 | ) | $ | 5,677 |
The municipal obligations held at a fair value of $745 at September 30, 2012 all mature in less than three years. During the nine month periods ended September 30, 2012 and 2011, the proceeds from the maturities and sales of available-for-sale securities were $3,689 and $5,650, respectively. There were no gross realized gains (losses) on sales of available-for-sale securities (net of tax) for the nine month periods ended September 30, 2012 and 2011, respectively. The Company’s trading securities portfolio totaled $1,317 at September 30, 2012 and $1,429 at December 31, 2011, and generated gains of $44 and losses of $121 for the three months ended September 30, 2012 and 2011, respectively and generated gains of $104 and losses of $46 for the nine months ended September 30, 2012 and 2011, respectively. As of September 30, 2012 and December 31, 2011, the Company had unrealized losses of $4 and $5, respectively, in its U.S. government securities funds. These losses are due to the interest rate sensitivity of the U.S. government securities funds.

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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 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 3, 19, 20, 21, 22, 137 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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 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 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 7: 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=6872113&loc=d3e27232-111563 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=6872113&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 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 10: 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=6872113&loc=d3e27290-111563 + Details
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