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Short-term Investments | 12 Months Ended
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Dec. 31, 2013
Short-term Investments [Abstract] |
Short-Term Investments | SHORT-TERM INVESTMENTS Short-term marketable securities for the periods presented were comprised of the following (in thousands):
| December 31, 2013
Security Type | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. government fixed income securities | $ | 130,971 |  |  | $ | 21 |  |  | $ | (975 | ) |  | $ | 130,017 |
Total short-term investments | $ | 130,971 |  |  | $ | 21 |  |  | $ | (975 | ) |  | $ | 130,017 |
| December 31, 2012
Security Type | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. government fixed income securities | $ | 87,394 |  |  | $ | 20 |  |  | $ | (411 | ) |  | $ | 87,003 |
Equity securities of certain technology companies | 3,254 |  |  | — |  |  | (782 | ) |  | 2,472 |
Total short-term investments | $ | 90,648 |  |  | $ | 20 |  |  | $ | (1,193 | ) |  | $ | 89,475 |
Short-term investments at December 31, 2013 and 2012 were comprised of investments in highly liquid, AAA, U.S. government fixed income securities with maturity dates ranging from 2014 to 2015, and 2013 to 2014, respectively. Short-term marketable securities in unrealized loss positions at December 31, 2013 and 2012 have been in continuous unrealized loss positions for less than one year. U.S. government fixed income securities. The gross unrealized loss can be primarily attributed to a combination of market conditions as well as the demand for and duration of the U.S. government fixed income securities. The Company has the ability to hold these securities until maturity, currently has no intent to sell, there is no requirement to sell and the Company believes that it can recover the amortized cost of these investments. The Company has found no evidence of impairment due to credit losses in its portfolio. Therefore, these unrealized losses were recorded in other comprehensive income (loss). However, the Company cannot provide any assurance that its portfolio of short-term marketable securities will not be impacted by adverse conditions in the financial markets, which may require the Company in the future to record an impairment charge for credit losses which could adversely impact its financial results. For the year ended December 31, 2013, proceeds from the sale of short-term marketable securities classified as available-for-sale were $239,370,000, gross realized gains were $1,174,000 and gross realized losses were $981,000. For the year ended December 31, 2012, proceeds from the sale of short-term marketable securities classified as available-for-sale were $319,811,000, gross realized gains were $31,000 and gross realized losses were $555,000. Proceeds from the sale of short-term marketable securities classified as available-for-sale and related gross realized gains and losses were not material for the year ended December 31, 2011.

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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 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: 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=27724398&loc=d3e27357-111563 Reference 3: 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 4: 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 5: 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=27724398&loc=d3e27232-111563 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=27724398&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 10 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 Reference 9: 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 + Details
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