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Derivative and hedging instruments (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Aluminum Sales Premium Contracts [Member]
T
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Jun. 30, 2012
Primary Aluminum Put Option Contracts [Member]
Due From Affiliates [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2011
Primary Aluminum Put Option Contracts [Member]
Due From Affiliates [Member]
Designated as Hedging Instrument [Member]
Jun. 30, 2012
Primary Aluminum Put Option Contracts [Member]
Prepaid and Other Current Assets [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2011
Primary Aluminum Put Option Contracts [Member]
Prepaid and Other Current Assets [Member]
Designated as Hedging Instrument [Member]
Jun. 30, 2012
Power Contracts [Member]
Not Designated as Hedging Instrument [Member]
MWh
Dec. 31, 2011
Power Contracts [Member]
Not Designated as Hedging Instrument [Member]
MWh
Jun. 30, 2012
Power Contracts [Member]
Prepaid and Other Current Assets [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2011
Power Contracts [Member]
Prepaid and Other Current Assets [Member]
Designated as Hedging Instrument [Member]
Jun. 30, 2012
E.ON Contingent Obligation [Member]
Other Liabilities [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2011
E.ON Contingent Obligation [Member]
Other Liabilities [Member]
Designated as Hedging Instrument [Member]
Jun. 30, 2012
Aluminum Sales Premium Contract [Member]
Other Liabilities [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2011
Aluminum Sales Premium Contract [Member]
Other Liabilities [Member]
Designated as Hedging Instrument [Member]
Jun. 30, 2012
Aluminum Sales Premium Contract [Member]
Accrued and Other Current Liabilities [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2011
Aluminum Sales Premium Contract [Member]
Accrued and Other Current Liabilities [Member]
Designated as Hedging Instrument [Member]
Jun. 30, 2012
Natural Gas Forward Contracts [Member]
Accrued and Other Current Liabilities [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2011
Natural Gas Forward Contracts [Member]
Accrued and Other Current Liabilities [Member]
Designated as Hedging Instrument [Member]
Jun. 30, 2012
Primary Aluminum Sales Contract Premium [Member]
Not Designated as Hedging Instrument [Member]
t
Dec. 31, 2011
Primary Aluminum Sales Contract Premium [Member]
Not Designated as Hedging Instrument [Member]
t
Jun. 30, 2012
Primary Aluminum Put Option Contracts [Member]
Not Designated as Hedging Instrument [Member]
t
Dec. 31, 2011
Primary Aluminum Put Option Contracts [Member]
Not Designated as Hedging Instrument [Member]
t
Jun. 30, 2012
Primary Aluminum Put Option Contracts [Member]
Not Designated as Hedging Instrument [Member]
Related Party [Member]
t
Dec. 31, 2011
Primary Aluminum Put Option Contracts [Member]
Not Designated as Hedging Instrument [Member]
Related Party [Member]
t
Fair value of derivative assets and liabilities by balance sheet location [Abstract]                                                    
DERIVATIVE ASSETS     $ 0 $ 9,437 $ 0 $ 5,439 $ 0 $ 3,892     $ 0 $ 106                            
DERIVATIVE LIABILITIES     16,089 15,147                 14,663 13,958 313 301 1,048 607 65 281            
Outstanding forward contracts not designated as hedging instruments [Abstract]                                                    
Power contracts (in megawatt hours (MWH))                 0 [1] 3,772 [1]                                
Aluminum forward contract outstanding (in metric tons)                                         30,600 [2] 40,870 [2] 0 15,000 0 18,000
Primary aluminim physical delivery contract through Decmeber 31, 2013 (in metric tons per year)   20,400                                                
Accumulated other comprehensive loss to be reclassified to earnings over the next 12-month period $ 65                                                  
[1] Represents our expected usage during the remaining term of the Ravenswood power contract. In June 2011, the West Virginia PSC extended the term of this contract for an additional year.
[2] Represents the remaining physical deliveries under our 2013 Glencore Metal Agreement.