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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