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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 | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
E.ON Contingent Obligation [Member] | Net Gain (Loss) on Forward Contracts [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (loss) recognized in income from derivatives | $ 353 | $ 0 | $ 16,428 | $ 0
E.ON Contingent Obligation [Member] | Interest Expense - Third Party [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (loss) recognized in income from derivatives | (353) | (353) | (1,059) | (1,059)
Midwest Premium Contracts [Member] | Net Gain (Loss) on Forward Contracts [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (loss) recognized in income from derivatives | 363 | 0 | 363 | 0
Primary Aluminum Put Option Contracts [Member] | Net Gain (Loss) on Forward Contracts [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (loss) recognized in income from derivatives | 0 | 0 | 0 | (2,725)
Aluminum Sales Premium Contracts [Member] | Net Gain (Loss) on Forward Contracts [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (loss) recognized in income from derivatives | (276) | (404) | (640) | (1,389)
Aluminum Sales Premium Contracts [Member] | Related Party Sales [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (loss) recognized in income from derivatives | $ 278 | $ 386 | $ 1,039 | $ 917

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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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