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Fair value measurements (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Derivative Liabilities - Net [Member]
Mar. 31, 2012
Derivative Liabilities - Net [Member]
Dec. 31, 2010
Derivative Liabilities - Net [Member]
Mar. 31, 2013
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Mar. 31, 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]
Mar. 31, 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]
Mar. 31, 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]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                        
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred $ 153                      
ASSETS:                        
Cash equivalents         182,844 168,309 182,844 168,309 0 0 0 0
Trust assets         13,433 [1] 14,254 [1] 13,433 [1] 14,254 [1] 0 [1] 0 [1] 0 [1] 0 [1]
Surety bond – workers comp insurance         2,123 2,123 2,123 2,123 0 0 0 0
TOTAL         198,400 184,686 198,400 184,686 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         1,030 1,170 0 0 0 0 1,030 1,170
TOTAL         1,030 16,539 0 0 0 0 1,030 16,539
Level 3 fair value measurements [Roll Forward]                        
Beginning balance   (16,539)   (14,760)                
Total gain (realized/unrealized) included in earnings   15,509 (613)                  
Settlements   0 (53)                  
Ending balance   (1,030) (15,426) (14,760)                
Amount of total loss included in earnings attributable to the change in unrealized losses (gains) relating to assets and liabilities held   $ (15,509) $ 613                  
[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 March 31, 2013 and management's estimate of the LME forward market for periods beyond the quoted periods, 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 9 Debt for additional information about the E.ON contingent obligation fair value.