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Fair value measurements (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Derivative Liabilities - Net [Member]
Mar. 31, 2013
Derivative Liabilities - Net [Member]
Mar. 31, 2014
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2013
Fair Value, Measurements, Recurring [Member]
Mar. 31, 2014
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Mar. 31, 2014
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Mar. 31, 2014
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
ASSETS:                    
Cash equivalents     $ 40,939 $ 49,658 $ 40,939 $ 49,658 $ 0 $ 0 $ 0 $ 0
Trust assets     10,211 11,151 10,211 11,151 0 0 0 0
Surety bonds     2,002 2,002 2,002 2,002 0 0 0 0
Midwest premium contracts       140   0   0   140
TOTAL     53,152 62,951 53,152 62,811 0 0 0 140
LIABILITIES:                    
E.ON contingent obligation – net (1)     0 [1] 0 [1] 0 [1] 0 [1] 0 [1] 0 [1] 0 [1] 0 [1]
Primary aluminum sales contract       140   0   0   140
TOTAL     0 140 0 0 0 0 0 140
Level 3 fair value measurements [Roll Forward]                    
Beginning balance, January 1, 0 (16,539)                
Total gain (loss) included in earnings (940) 15,509                
Settlements 940 0                
Ending balance, March 31, 0 (1,030)                
Amount of gain (loss) included in earnings attributable to the change in unrealized losses relating to assets and liabilities held at March 31, $ 140 $ 15,509                
[1] See Note 9 Debt for additional information about the E.ON contingent obligation.