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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended |
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Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 Money market funds | Dec. 31, 2013 Money market funds | Mar. 31, 2014 Corporate notes, bonds and commercial paper | Dec. 31, 2013 Corporate notes, bonds and commercial paper | Mar. 31, 2014 Recurring basis Total | Dec. 31, 2013 Recurring basis Total | Mar. 31, 2014 Recurring basis Total Money market funds | Dec. 31, 2013 Recurring basis Total Money market funds | Mar. 31, 2014 Recurring basis Total Corporate notes, bonds and commercial paper | Dec. 31, 2013 Recurring basis Total Corporate notes, bonds and commercial paper | Mar. 31, 2014 Recurring basis Quoted Market Prices in Active Markets (Level 1) | Dec. 31, 2013 Recurring basis Quoted Market Prices in Active Markets (Level 1) | Mar. 31, 2014 Recurring basis Quoted Market Prices in Active Markets (Level 1) Money market funds | Dec. 31, 2013 Recurring basis Quoted Market Prices in Active Markets (Level 1) Money market funds | Mar. 31, 2014 Recurring basis Quoted Market Prices in Active Markets (Level 1) Corporate notes, bonds and commercial paper | Dec. 31, 2013 Recurring basis Quoted Market Prices in Active Markets (Level 1) Corporate notes, bonds and commercial paper | Mar. 31, 2014 Recurring basis Significant Other Observable Inputs (Level 2) | Dec. 31, 2013 Recurring basis Significant Other Observable Inputs (Level 2) | Mar. 31, 2014 Recurring basis Significant Other Observable Inputs (Level 2) Money market funds | Dec. 31, 2013 Recurring basis Significant Other Observable Inputs (Level 2) Money market funds | Mar. 31, 2014 Recurring basis Significant Other Observable Inputs (Level 2) Corporate notes, bonds and commercial paper | Dec. 31, 2013 Recurring basis Significant Other Observable Inputs (Level 2) Corporate notes, bonds and commercial paper | Mar. 31, 2014 Recurring basis Significant Unobservable Inputs (Level 3) | Dec. 31, 2013 Recurring basis Significant Unobservable Inputs (Level 3) | Mar. 31, 2014 Recurring basis Significant Unobservable Inputs (Level 3) Money market funds | Dec. 31, 2013 Recurring basis Significant Unobservable Inputs (Level 3) Money market funds | Mar. 31, 2014 Recurring basis Significant Unobservable Inputs (Level 3) Corporate notes, bonds and commercial paper | Dec. 31, 2013 Recurring basis Significant Unobservable Inputs (Level 3) Corporate notes, bonds and commercial paper | Mar. 31, 2014 Nonrecurring basis | Mar. 31, 2014 Nonrecurring basis Quoted Market Prices in Active Markets (Level 1) | Mar. 31, 2014 Nonrecurring basis Significant Other Observable Inputs (Level 2) | Mar. 31, 2014 Nonrecurring basis Significant Unobservable Inputs (Level 3)
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total available-for-sale securities | $ 376,116 | $ 359,097 | $ 317,769 | $ 300,605 | $ 58,347 | $ 58,492 | $ 376,116 | $ 359,097 | $ 317,769 | $ 300,605 | $ 58,347 | $ 58,492 | $ 317,769 | $ 300,605 | $ 317,769 | $ 300,605 | $ 0 | $ 0 | $ 58,347 | $ 58,492 | $ 0 | $ 0 | $ 58,347 | $ 58,492 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |
Investment in non-marketable equity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600 |  |  |
Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 600
Impairment of investment in non-marketable equity security |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |

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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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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -URI http://asc.fasb.org/extlink&oid=27724398&loc=SL6284393-111563 + Details
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- Definition Value of the not readily marketable security or category which has been determined by management based upon fair value methods, including pricing of similar securities and valuation techniques and is included in the schedule of financial condition or the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 820 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=29644083&loc=d3e45360-110995 + Details
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