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Notes Payable Convertible Senoir Notes Due 2015 (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Debt Instrument [Line Items] |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 16,000,000 |  |
Investment Warrants, Exercise Price | $ 16.00 |  |
Warrants, Deliverable | 11,600,000 |  |
Proceeds from Issuance of Warrants | $ 0 | $ 0 | $ 15,600,000
Convertible Debt Issued in 2010 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 8.90% |  |
Principal Amount of Convertible Senior Notes Payable at Issuance | 200,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.50% |  |
Deferred Finance Costs, Gross | 6,800,000 |  |
Number of Days Holders May Convert | 5 |  |
Measurement Period of Convertible Senior Notes | 10 |  |
Debt Instrument, Face Amount | 1,000 |  |
Product of Last Reported Common Stock Sale Price and Conversion Rate | 98.00% |  |
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 | 130.00% |  |
Debt Instrument, Convertible, Conversion Price | $ 12.35 |  | $ 12.50
Debt Instrument, Convertible, Number of Equity Instruments, Shares | 80.9486 |  | 80
Debt Instrument, Convertible, Fundamental Change Stock Price Floor | 10.00 |  |
Debt Instrument, Convertible, Conversion Rate Increase Upon Fundamental Change | 20 |  |
2015 Notes Embedded Conversion Derivative [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Derivative, Liability, Fair Value at Issuance | 37,000,000 |  |
Derivative instruments | 43,100,000 | 45,600,000 |
2015 Notes Hedges [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Derivative, Asset, Fair Value, Issuance | 37,000,000 |  |
Derivative Liability, Fair Value, Gross Liability | $ 43,100,000 | $ 45,600,000 |
Derivative, Conversion Spread, Shares | 16,000,000 |  |
Derivative, Asset, Strike Price | $ 12.50 |  |

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 maximum number of shares that the conversion rate will increase upon the occurrence of a fundamental change, as defined in the indenture. + References No definition available. + Details
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- Definition Common stock must be a price of at least this amount to allow the conversion rate to increase by an amount of shares upon a fundamental change that is defined in the note instrument. + References No definition available. + Details
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- Definition The number of equity instruments 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 price per share that we will be entitled to receive if we opt to exercise the call options of the 2015 notes hedge. + References No definition available. + Details
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- Definition Number of shares that is the basis for the amount of cash that we are entitled to if we exercise the call options in the 2015 notes hedge. + References No definition available. + Details
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- Definition The number of consecutive days that the trading price of convertible senior notes must be less than 98% of the product of the last reported sale price of common stock and the applicable conversion rate on such trading day to allow the holders of the convertible notes to convert within the following 5 day period after such occurrence. + References No definition available. + Details
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- Definition Represents the number of days that the holders of convertible notes may convert their notes due to the circumstance where during a 10 consecutive trading day period the trading price of the convertible notes was less than 98% of the product of the last reported sale price of common stock and applicable conversion rate on such trading day. + 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 This represents the floor of the measurement to determine convertibility of convertible senior notes. If during any 10 consecutive trading day period in which the trading price per $1,000 principal amount of notes was less than 98% of the product of the last reported sale price of our common stock and the applicable conversion rate on such trading day, the holders of the convertible senior notes may convert their holdings for 5 business days following such 10 day period. + References No definition available. + Details
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