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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		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 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	$ 1,970	$ (1,060)	$ (2,725)	$ (5,666)
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	(520)	(668)	(985)	(866)
Aluminum Sales Premium Contracts [Member] \| Related Party Sales [Member]
Derivatives not designated as hedging instruments [Abstract]
Gain (loss) recognized in income from derivatives	$ 328	$ 162	$ 532	$ 256

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.

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