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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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 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 $ (276) $ (153) $ (640)
Primary Aluminum Sales Contracts [Member] | Related Party Sales [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in income from derivatives 0 278 292 1,039
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 1,059 16,428
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) (1,059) (1,059)
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 $ 363 $ (1,080) $ 363