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Basis of Presentation (Narrative) (Details) (USD $) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2011 | Jun. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2010
Amount of application under DOE Loan Guarantee Program | $ 2,000,000,000 |  |  |  |
Adjustments to Additional Paid in Capital, Stock Split | 12,500,000 | 0 |  |  |
Cash and cash equivalents | 314,200,000 | 37,600,000 |  | 292,900,000 | 151,000,000
Convertible senior notes | 530,000,000 |  |  | 0 |
Convertible Noteholders, Percent of New Common Stock | 79.04% |  |  |  |
Convertible Noteholders, New Notes | 200,000,000 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 110,000,000 |  |
NYSE Minimum 30 Day Average Closing Price | $ 1.00 |  |  |  |
NYSE 30-Day Market Capitalization Subject to Suspension | 15,000,000 |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 12.75% |  |  |  |
Preferred Stock, Shares Outstanding | 85,903 |  |  |  |
Convertible preferred stock and accrued dividends payable-in-kind | 113,900,000 |  |  | 100,500,000 |
Warrants Outstanding | 250,000 |  |  |  |
Preferred Investors, Each, Percent of New Common Stock | 7.98% |  |  |  |
Preferred Investors, Aggregate, Percent of New Common Stock | 15.96% |  |  |  |
Preferred Investors, Each, New Notes | 20,190,000 |  |  |  |
Preferred Investors, Aggregate, New Notes | 40,380,000 |  |  |  |
Stockholders, Percent of New Common Stock | 5.00% |  |  |  |
Debtor-in-Possession Financing, Amount Arranged | 50,000,000 |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding | 10.50% |  |  |  |
Preconfirmation, Debtor-in-Possession Financing | $ 20,000,000 |  |  |  |

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