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Subsequent Event (Narrative) (Details) (USD $) | 0 Months Ended |  |  |  |  |  |  |  | 0 Months Ended |
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Oct. 24, 2013 | Oct. 22, 2013 | Aug. 26, 2013 | Sep. 30, 2013 September 2015 Notes [Member] | Dec. 31, 2012 September 2015 Notes [Member] | Sep. 30, 2013 December 2029 Notes [Member] | Dec. 31, 2012 December 2029 Notes [Member] | Sep. 30, 2010 2015 Notes Hedges [Member] | Oct. 22, 2013 Subsequent Event [Member] | Oct. 24, 2013 Subsequent Event [Member] September 2015 Notes [Member] | Oct. 24, 2013 Subsequent Event [Member] December 2029 Notes [Member] | Oct. 22, 2013 Subsequent Event [Member] 2015 Notes Hedges [Member] counterparties
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding call options and warrants settled pursuant to agreement |  | 50.00% | 50.00% |  |  |  |  |  | 50.00% |  |  |
Net cash received from counterparties for settlement of call options and warrants |  |  |  |  |  |  |  |  | $ 20,300,000 |  |  |
Warrants outstanding after settlement |  |  |  |  |  |  |  |  | 8,100,000 |  |  |
Warrants, strike price |  |  |  |  |  |  |  |  | $ 15.81 |  |  |
Number of counterparties remaining under outstanding call options |  |  |  |  |  |  |  |  |  |  |  | 2
Derivative, conversion spread, shares |  |  |  |  |  |  |  | 16,000,000 |  |  |  | 8,100,000
Derivative, asset, strike price |  |  |  |  |  |  |  | $ 12.50 |  |  |  | $ 12.35
Extinguishment of debt, amount |  |  |  |  |  |  |  |  |  | 72,300,000 | 29,600,000 |
Extinguishment of debt, cash paid | 127,600,000 |  |  |  |  |  |  |  |  | 83,200,000 | 44,400,000 |
Extinguishment of debt, cash paid for shares of common stock |  |  |  |  |  |  |  |  |  | 44,500,000 | 22,300,000 |
Extinguishment of debt, shares issued |  |  |  |  |  |  |  |  |  | 2,079,295 | 1,039,485 |
Convertible debt, carrying value |  |  |  | 183,580,000 | 178,056,000 | 107,872,000 | 103,570,000 |  |  | 66,600,000 | 27,700,000 |
Extinguishment of debt, gain (loss), net of tax |  |  |  |  |  |  |  |  |  | $ (8,100,000) | $ (3,300,000) |

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- Definition Amount of outstanding call options and warrants settled pursuant to agreement, percentage + 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 Net cash received from counterparties for settlement of call options and warrants. + References No definition available. + Details
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- Definition Number of counterparties remaining under outstanding call options. + References No definition available. + Details
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- Definition Exercise price of the warrants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A + Details
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