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Derivative and hedging instruments (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
Dec. 31, 2013
Midwest Premium Contracts [Member]
Not Designated as Hedging Instrument [Member]
t
Dec. 31, 2012
Midwest Premium Contracts [Member]
Not Designated as Hedging Instrument [Member]
t
Dec. 31, 2013
Midwest Premium Contracts [Member]
Prepaid and Other Current Assets [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2012
Midwest Premium Contracts [Member]
Prepaid and Other Current Assets [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2013
E.ON Contingent Obligation [Member]
Other Liabilities [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2012
E.ON Contingent Obligation [Member]
Other Liabilities [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2013
Primary Aluminum Sales Contracts [Member]
Accrued and Other Current Liabilities [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2012
Primary Aluminum Sales Contracts [Member]
Accrued and Other Current Liabilities [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2013
Primary Aluminum Sales Contract Premium [Member]
Not Designated as Hedging Instrument [Member]
t
Dec. 31, 2012
Primary Aluminum Sales Contract Premium [Member]
Not Designated as Hedging Instrument [Member]
t
Fair value of derivative assets and liabilities by balance sheet location [Abstract]                          
DERIVATIVE ASSETS   $ 140 $ 0     $ 140 $ 0            
DERIVATIVE LIABILITIES   140 16,539         0 [1] 15,369 [1] 140 1,170    
Outstanding forward contracts not designated as hedging instruments [Abstract]                          
Primary aluminum sales contract premium (tonnes) (1)                       1,782 [2] 20,400 [2]
Midwest premium contracts (tonnes)       6,000 0                
Accumulated other comprehensive loss to be reclassified to earnings over the next 12-month period $ 153                        
[1] See Note 6 Debt for additional information about the E.ON contingent obligation.
[2] Represents the remaining physical deliveries under the Glencore Metal Agreement.