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Investments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Short-term Investments [Member] | Dec. 31, 2013 Marketable securities [Member] | Sep. 30, 2014 Marketable securities [Member]
Available-for-sale Securities |  |  |  |  |  |  |
Cost |  |  |  |  | $ 49,559 | $ 17,649 | $ 9,678
Gross Unrealized Losses |  |  |  |  | (44) | (3,300) | (786)
Gross Unrealized Gains |  |  |  |  | 5 | 172 | 270
Available-for-sale Securities, Estimated Fair Value |  |  |  |  | 49,520 | 14,521 | 9,162
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |  |  |  |  |
Unrealized Losses Total |  |  |  |  | (44) | (3,300) | (786)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |  |  |  |  |
Less than twelve Months, Unrealized Losses |  |  |  |  | (44) |  | (107)
Less than twelve Months, Fair Value |  |  |  |  | 33,125 |  | 1,904
Twelve months or more, Unrealized Losses |  |  |  |  | 0 |  | (679)
Twelve months or more, Fair Value |  |  |  |  | 0 |  | 1,365
Unrealized Losses |  |  |  |  | (44) |  | (786)
Fair Value |  |  |  |  | 33,125 |  | 3,269
Investment in Marketable Securities (Textual) [Abstract] |  |  |  |  |  |  |
Unrealized gain (loss) on available for sale securities | (1,086) | 301 | (1,487) | (10,756) |  |  |
Impairment of marketable securities | $ 1,092 | $ 870 | $ 4,614 | $ 18,097 |  |  |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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