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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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 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 $ 0 $ (149) $ (153) $ (364)
Primary Aluminum Sales Contracts [Member] | Related Party Sales [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in income from derivatives 0 406 292 761
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 353 353 706 16,075
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) (706) (706)
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 $ 0 $ 0 $ (1,080) $ 0