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Fair value measurements (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Derivative Liabilities - Net [Member]
Jun. 30, 2012
Derivative Liabilities - Net [Member]
Jun. 30, 2013
Derivative Liabilities - Net [Member]
Jun. 30, 2012
Derivative Liabilities - Net [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
ASSETS:                        
Cash equivalents         $ 105,104 $ 168,309 $ 105,104 $ 168,309 $ 0 $ 0 $ 0 $ 0
Trust assets         12,276 [1] 14,254 [1] 12,276 [1] 14,254 [1] 0 [1] 0 [1] 0 [1] 0 [1]
Surety bond – workers comp insurance         1,574 2,123 1,574 2,123 0 0 0 0
TOTAL         118,954 184,686 118,954 184,686 0 0 0 0
LIABILITIES:                        
E.ON contingent obligation – net         0 [2] 15,369 0 [2] 0 0 [2] 0 0 [2] 15,369
Primary aluminum sales contract – premium collar         773 1,170 0 0 0 0 773 1,170
TOTAL         773 16,539 0 0 0 0 773 16,539
Level 3 fair value measurements [Roll Forward]                        
Beginning balance, January 1, (1,030) (15,426) (16,539) (14,760)                
Total gain (loss) (realized/unrealized) included in earnings 257 (545) 15,766 (1,158)                
Settlements 0 (53) 0 (106)                
Ending balance, June 30, (773) (16,024) (773) (16,024)                
Amount of gain (loss) included in earnings attributable to the change in unrealized losses relating to assets and liabilities held $ 257 $ (545) $ 15,766 $ (1,158)                
[1] Trust assets are currently invested in money market funds and excludes the cash surrender value of the life insurance policies in the trust.
[2] Based on the LME forward market prices for primary aluminum at June 30, 2013 and management's estimate of the LME forward market for periods beyond the quoted periods, we believe that we will not have any payment obligations for the E.ON contingent obligation through the term of the agreement which expires in 2028. See Note 10 Debt for additional information about the E.ON contingent obligation fair value.