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Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Carrying value and estimated fair value of convertible notes and long-term debt |  |  |  |
Convertible senior notes, net of discount |  |  | $ 99,738 |
Capital lease obligations | 1,890 |  | 1,642 |
Capital lease obligations, fair value | 1,869 |  | 1,611 |
Convertible senior secured notes (2010 Notes) [Member] |  |  |  |
Carrying value and estimated fair value of convertible notes and long-term debt |  |  |  |
Debt instrument, fair value |  | [1] | 37,561 | [1]
Convertible senior unsecured notes (2008 Notes) [Member] |  |  |  |
Carrying value and estimated fair value of convertible notes and long-term debt |  |  |  |
Convertible senior notes, net of discount | 56,263 | [1] | 69,880 | [1]
Carrying Value [Member] |  |  |  |
Carrying value and estimated fair value of convertible notes and long-term debt |  |  |  |
Capital lease obligations | 1,890 |  | 1,642 |
Carrying Value [Member] | Convertible senior secured notes (2010 Notes) [Member] |  |  |  |
Carrying value and estimated fair value of convertible notes and long-term debt |  |  |  |
Convertible senior notes, net of discount |  | [1] | 34,134 | [1]
Carrying Value [Member] | Convertible senior unsecured notes (2008 Notes) [Member] |  |  |  |
Carrying value and estimated fair value of convertible notes and long-term debt |  |  |  |
Convertible senior notes, net of discount | $ 54,062 | [1] | $ 65,604 | [1]
[1] | The carrying value of the convertible senior notes and senior secured notes is representative of the bifurcated debt components only, while the fair value is based on the market value of the respective notes, which includes the convertible equity component

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- Definition Amount equal to the fair value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executor costs such as insurance, maintenance, and taxes to be paid by the lesser, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date. + References No definition available. + Details
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- Definition Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock, net of the component of interest expense representing the noncash expenses charged against earnings in the period to allocate debt discount or premium, and the costs to issue debt and obtain financing over the related convertible debt instruments. + References No definition available. + Details
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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date. + 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45023-112735 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 7, 10, 13 -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. + 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611 + Details
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