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Commitment and Contingencies (Details) (USD $)	3 Months Ended
Commitment and Contingencies (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Commitments and Contingencies
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
Contingent commercial ACP license royalty limit	665,000,000
NYSE 30-day average minimum market capitalization	50,000,000
Stockholders' Equity (Deficit)	(469,600,000)	(472,900,000)	728,900,000	752,400,000
PBGC estimate of potential Portsmouth pension liability	$ 130,000,000

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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