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Commitment and Contingencies (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]        
Amount of application under DOE Loan Guarantee Program $ 2,000,000,000      
Potential financing from Japanese export credit agencies under discussion 1,000,000,000      
Minimum additional financing needed for ACP beyond DOE and Japanese 1,000,000,000      
NYSE 30-day average minimum market capitalization 50,000,000      
NYSE Minimum 30 Day Average Closing Price $ 1.00      
NYSE 30-Day Market Capitalization Subject to Suspension 15,000,000      
Stockholders’ Equity (Deficit) (419,200,000) (472,900,000) 642,600,000 752,400,000
PBGC estimate of potential Portsmouth pension liability 130,000,000      
Long-Term Debt $ 530,000,000 $ 530,000,000    
Minimum Paducah SWU Production Under 2002 DOE-USEC Agreement 3,500,000