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Derivative and hedging instruments Part 2 (Details) (Not Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
E.ON Contingent Obligation [Member] | Net Gain (Loss) on Forward and Derivative Contracts [Member]
Derivatives not designated as hedging instruments [Abstract]
Gain (loss) recognized in income from derivatives	$ 16,781	$ 0
E.ON Contingent Obligation [Member] | Interest Expense [Member]
Derivatives not designated as hedging instruments [Abstract]
Gain (loss) recognized in income from derivatives	(1,412)	1,411
Midwest Premium Contracts [Member] | Net Gain (Loss) on Forward and Derivative Contracts [Member]
Derivatives not designated as hedging instruments [Abstract]
Gain (loss) recognized in income from derivatives	140	0
Primary Aluminum Put Option Contracts [Member] | Net Gain (Loss) on Forward and Derivative Contracts [Member]
Derivatives not designated as hedging instruments [Abstract]
Gain (loss) recognized in income from derivatives	0	(2,725)
Primary Aluminum Sales Contracts [Member] | Net Gain (Loss) on Forward and Derivative Contracts [Member]
Derivatives not designated as hedging instruments [Abstract]
Gain (loss) recognized in income from derivatives	(323)	(1,571)
Primary Aluminum Sales Contracts [Member] | Related Party Sales [Member]
Derivatives not designated as hedging instruments [Abstract]
Gain (loss) recognized in income from derivatives	1,353	1,309
Power Contracts [Member] | Net Gain (Loss) on Forward and Derivative Contracts [Member]
Derivatives not designated as hedging instruments [Abstract]
Gain (loss) recognized in income from derivatives	$ 0	$ 147

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a),(c),(d),(e)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

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- Details

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