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Derivative and hedging instruments, part 2 (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			12 Months Ended
	Dec. 31, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Primary Aluminum Put Option and Call Contracts [Member] Net Gain (Loss) on Forward Contracts [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Primary Aluminum Put Option and Call Contracts [Member] Net Gain (Loss) on Forward Contracts [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Aluminum Sales Premium Contracts [Member] Net Gain (Loss) on Forward Contracts [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Aluminum Sales Premium Contracts [Member] Net Gain (Loss) on Forward Contracts [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Aluminum Sales Premium Contracts [Member] Related Party Sales [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Aluminum Sales Premium Contracts [Member] Related Party Sales [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Power Contracts [Member] Net Gain (Loss) on Forward Contracts [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Power Contracts [Member] Net Gain (Loss) on Forward Contracts [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] E.ON Contingent Obligation [Member] Interest Expense [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] E.ON Contingent Obligation [Member] Interest Expense [Member]
Derivatives not designated as hedging instruments [Abstract]
Gain (loss) recognized in income from derivatives				$ 1,645	$ (10,053)	$ (1,013)	$ (534)	$ 888	$ 465	$ 172	$ 92	$ 1,429	$ 0
Natural gas forward financial purchase contracts (in MMBTU)		350,000	250,000
Loss recognized in income on derivative (ineffective portion)	$ 1,701

X

- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

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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.

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X

- Definition

The portion of losses on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ 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 25

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (d)

-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.

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