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Notes Payable Convertible Debt Issued in 2004 (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Debt Instrument [Line Items] |  |  |
Loss on Extinguishment of Debt | $ 0 | $ 0 | $ (292,000)
Convertible Debt Issued in 2009 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount of Convertible Senior Notes Payable at Issuance | 115,800,000 |  |
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt | 15,600,000 |  |
Deferred Income Tax Liability, Equity Component of Convertible Debt | 11,000,000 |  |
Debt Instrument, Convertible, Conversion Price | $ 9.57 |  |
Debt Instrument, Convertible, Number of Shares | 104.5 |  |
Convertible Debt Issued in 2004 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 8.50% |  |
Debt Instrument, Face Amount | 1,000 |  |
Principal Amount of Convertible Senior Notes Payable, Extinguished in Exchange for Subsequent Issuance |  |  | 63,600,000
Principal Amount of Convertible Senior Notes Payable at Issuance | 260,000,000 |  |
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt | 22,900,000 |  |
Deferred Income Tax Liability, Equity Component of Convertible Debt | 16,100,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.25% |  |
Convetible Senior Notes, Contingent Interest Rate | 0.50% |  |
Number of Days to Measure Stock Value Against Conversion Value | 20 |  |
Consecutive Trading Day Period to Determine Convertibility | 30 |  |
Stock Price Must Exceed Conversion Price to Allow Conversion | 120.00% |  |
Debt Instrument, Convertible, Conversion Price | $ 13.74 |  |
Debt Instrument, Convertible, Number of Shares | 72.8 |  |
Extinguishment of Debt, Amount |  | 6,700,000 |
Loss on Extinguishment of Debt |  | 300,000 |
Exchange of Debt, Unamortized Discount and Issue Costs of Extinguished Debt |  | 300,000 |
Extinguishment of Debt, Cash Paid |  | $ 6,600,000 |

X
- Definition The number of consecutive trading days ending on the last trading day of the immediately preceding calendar quarter in which 20 trading days of which our last reported price of common stock is greater than or equal to 130% of the conversion price of convertible debt. + References No definition available. + Details
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- Definition The additional interest paid on convertible senior notes outstanding under certain conditions based on the average trading price of the notes during a specified period. + References No definition available. + Details
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- Definition The number of shares that the holder of the debt instrument would receive if the debt was converted to equity. + References No definition available. + Details
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- Definition The income tax effect of recognizing the equity component of a convertible debt issuance. + References No definition available. + Details
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- Definition The amount of unamortized debt discount and debt issue costs on debt extinguished by issuing new debt during the reporting period. + References No definition available. + Details
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- Definition Number of trading days that the last reported price of our common stock during the period of a set number of consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to a certain percentage of the applicable conversion price on each applicable trading day to determine convertibility of notes. + References No definition available. + Details
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- Definition The amount that the last reported price of the common stock for at least a certain number of trading days must be greater than or equal to the conversion price on each applicable trading day. + References No definition available. + Details
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- Definition Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=6928081&loc=SL6014347-161799 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 65 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7667209&loc=SL6052262-162007 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 12 -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 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 The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + 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 FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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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