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Fair value measurements (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Derivative Liabilities - Net [Member]
Sep. 30, 2013
Derivative Liabilities - Net [Member]
Sep. 30, 2014
Derivative Liabilities - Net [Member]
Sep. 30, 2013
Derivative Liabilities - Net [Member]
Sep. 30, 2014
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2013
Fair Value, Measurements, Recurring [Member]
Sep. 30, 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]
Sep. 30, 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]
Sep. 30, 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         $ 125,960 $ 49,658 $ 125,960 $ 49,658 $ 0 $ 0 $ 0 $ 0
Trust assets         8,835 11,151 8,835 11,151 0 0 0 0
Surety bonds         1,987 2,002 1,987 2,002 0 0 0 0
Midwest premium contracts           140   0   0   140
TOTAL         136,782 62,951 136,782 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, period start 0 (773) 0 (16,539)                
Total gain (loss) included in earnings 0 365 (940) 16,131                
Settlements     940 0                
Ending balance, September 30, 0 (408) 0 (408)                
Amount of gain included in earnings attributable to the change in unrealized losses relating to assets and liabilities held at September 30, $ 0 $ 365 $ 0 $ 16,131                
[1] See Note 9 Debt for additional information about the E.ON contingent obligation.