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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
	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