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Cash and Cash Equivalents and Short-term Investments (Details 5) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Available-for-sale: |  |  |
Proceeds from sales and maturities | $ 22,313 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities | $ 107,586 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities | $ 24,010 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Realized gains (losses), net | $ 4,638 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | $ 88,158 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | $ 13,405 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in 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 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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