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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
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Mar. 31, 2014 | Mar. 31, 2013
Primary Aluminum Sales Contracts [Member] | Net Gain (Loss) on Forward and Derivative Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) recognized in income from derivatives | $ (152) | $ (215)
Primary Aluminum Sales Contracts [Member] | Related Party Sales [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) recognized in income from derivatives | 292 | 355
E.ON Contingent Obligation - Net [Member] | Net Gain (Loss) on Forward and Derivative Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) recognized in income from derivatives | 353 | 15,722
E.ON Contingent Obligation - Net [Member] | Interest Expense - Third Party [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) recognized in income from derivatives | (353) | (353)
Midwest Premium Contracts [Member] | Net Gain (Loss) on Forward and Derivative Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) recognized in income from derivatives | $ (1,080) | $ 0

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- 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 + Details
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