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Fair Value Measurements (Details) (USD $) | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | $ 358,991,000 | $ 235,751,000
Fair value measurements transfer to Level 1 From Level 2 | 11,100,000 | 11,400,000
Fair value measured transfer to Level 2 From Level 1 | 5,000,000 | 5,000,000
Fair value liabilities measurements transfer to Level 1 From Level 2 | 206,400,000 | 189,600,000
U.S. government securities |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 30,242,000 | 66,174,000
U.S. government agency securities |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 107,141,000 | 93,175,000
U.S. corporate notes |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 98,637,000 | 2,705,000
U.S. commercial paper |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 37,337,000 | 34,976,000
Money market funds |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 85,634,000 | 38,721,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets, Level 1 |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 255,929,000 | 163,501,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets, Level 1 | U.S. government securities |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 30,242,000 | 66,174,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets, Level 1 | U.S. government agency securities |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 58,893,000 | 55,901,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets, Level 1 | U.S. corporate notes |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 81,160,000 | 2,705,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets, Level 1 | Money market funds |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 85,634,000 | 38,721,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets, Level 1 | Convertible Subordinated Notes |  |
Estimated fair values of entity's financial assets |  |
Total liabilities measured at fair value | 206,388,000 |
Recurring basis | Significant Other Observable Inputs, Level 2 |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 103,062,000 | 72,250,000
Recurring basis | Significant Other Observable Inputs, Level 2 | U.S. government agency securities |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 48,248,000 | 37,274,000
Recurring basis | Significant Other Observable Inputs, Level 2 | U.S. corporate notes |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 17,477,000 |
Recurring basis | Significant Other Observable Inputs, Level 2 | U.S. commercial paper |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 37,337,000 | 34,976,000
Recurring basis | Significant Other Observable Inputs, Level 2 | Convertible Subordinated Notes |  |
Estimated fair values of entity's financial assets |  |
Total liabilities measured at fair value |  | 189,588,000
Recurring basis | Total |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 358,991,000 | 235,751,000
Recurring basis | Total | U.S. government securities |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 30,242,000 | 66,174,000
Recurring basis | Total | U.S. government agency securities |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 107,141,000 | 93,175,000
Recurring basis | Total | U.S. corporate notes |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 98,637,000 | 2,705,000
Recurring basis | Total | U.S. commercial paper |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 37,337,000 | 34,976,000
Recurring basis | Total | Money market funds |  |
Estimated fair values of entity's financial assets |  |
Total assets measured at fair value | 85,634,000 | 38,721,000
Recurring basis | Total | Convertible Subordinated Notes |  |
Estimated fair values of entity's financial assets |  |
Total liabilities measured at fair value | $ 206,388,000 | $ 189,588,000

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + 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=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. Fair value of convertible debt at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Convertible Security -URI http://asc.fasb.org/extlink&oid=6509036 + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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