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Investments (Tables) | 3 Months Ended
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Mar. 31, 2014
Investment in Marketable Securities [Abstract] |
Investments |
| At March 31, 2014
| Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Short-term investments | $ | 45,724 |  |  | $ | (96 | ) |  | $ | — |  |  | $ | 45,628 |
Marketable equity securities | 15,484 |  |  | (724 | ) |  | 886 |  |  | 15,646 |
| At December 31, 2013
| Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Marketable equity securities | $ | 17,649 |  |  | $ | (3,300 | ) |  | $ | 172 |  |  | $ | 14,521 |
Gross unrealized losses on investment securities | The following table summarizes the gross unrealized losses on investment securities for which other-than-temporary impairments have not been recognized and the fair values of those securities, aggregated by the length of time the individual securities have been in a continuous unrealized loss position, at March 31, 2014 (in thousands):
| Less than twelve months |  | Twelve months or more |  | Total
| Unrealized Losses | Fair Value |  | Unrealized Losses | Fair Value |  | Unrealized Losses | Fair Value
Short-term investments | $ | (96 | ) | $ | 45,628 |  |  | $ | — |  | $ | — |  |  | $ | (96 | ) | $ | 45,628 |
Marketable equity securities | $ | — |  | $ | — |  |  | $ | (724 | ) | $ | 1,320 |  |  | $ | (724 | ) | $ | 1,320 |

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- Definition Investment in marketable securities. + References No definition available. + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + 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 + Details
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