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Notes Payable Convertible Senior Notes Due 2029 (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012
Convertible Debt Issued 2009 [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Interest Rate, Effective Percentage | 11.90%
Convertible Debt Issued in 2009 [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Convertible, Conversion Price | $ 9.57
Principal Amount of Convertible Senior Notes Payable at Issuance, Issued for Cash | $ 52,200,000
Principal Amount of Convertible Senior Notes Payable at Issuance | 115,800,000
Principal Amount of Convertible Senior Notes Payable at Issuance, Issued in Exchange of Debt Outstanding | $ 63,600,000
Debt Instrument, Convertible, Number of Shares | 104.5

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- Definition The principal amount of convertible senior notes payable at the time the securities were issued. + References No definition available. + Details
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- Definition The principal amount of 2029 notes issued to extinguish outstanding notes issued in 2004. + References No definition available. + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 32 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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