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Derivative and hedging instruments Part 2 (Details) (Not Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Primary Aluminum Put Option Contracts [Member] | Net Gain (Loss) on Forward Contracts [Member]
Derivatives not designated as hedging instruments [Abstract]
Gain (loss) recognized in income from derivatives	$ (4,695)	$ (4,606)
Aluminum Sales Premium Contracts [Member] | Net Gain (Loss) on Forward Contracts [Member]
Derivatives not designated as hedging instruments [Abstract]
Gain (loss) recognized in income from derivatives	(465)	(198)
Aluminum Sales Premium Contracts [Member] | Related Party Sales [Member]
Derivatives not designated as hedging instruments [Abstract]
Gain (loss) recognized in income from derivatives	204	94
Power Contracts [Member] | Net Gain (Loss) on Forward Contracts [Member]
Derivatives not designated as hedging instruments [Abstract]
Gain (loss) recognized in income from derivatives	1	(5)
E.ON Contingent Obligation [Member] | Interest Expense [Member]
Derivatives not designated as hedging instruments [Abstract]
Gain (loss) recognized in income from derivatives	$ 353	$ 364

X

- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: 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=6935481&loc=SL5618551-113959



Reference 3: 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=6935481&loc=SL5624171-113959



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration