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Fair value measurements (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Derivative Liabilities - Net [Member]
Jun. 30, 2011
Derivative Liabilities - Net [Member]
Jun. 30, 2012
Derivative Liabilities - Net [Member]
Jun. 30, 2011
Derivative Liabilities - Net [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                          
Embedded Derivative, Fair Value of Embedded Derivative, Net $ 0                        
ASSETS:                          
Cash equivalents           145,492,000 176,284,000 145,492,000 176,284,000 0 0 0 0
Trust assets           15,160,000 15,889,000 15,160,000 15,889,000 0 0 0 0
Surety bond – workers comp insurance           2,391,000 2,391,000 2,391,000 2,391,000 0 0 0 0
Primary aluminum put option contracts             9,331,000   0   9,331,000   0
Power contract             106,000   0   0   106,000
TOTAL           163,043,000 204,001,000 163,043,000 194,564,000 0 9,331,000 0 106,000
LIABILITIES:                          
Natural gas forward financial contracts           65,000 281,000 0 0 65,000 281,000 0 0
E.ON contingent obligation – net           14,663,000 13,958,000 0 0 0 0 14,663,000 13,958,000
Primary aluminum sales contract – premium collar           1,361,000 908,000 0 0 0 0 1,361,000 908,000
TOTAL           16,089,000 15,147,000 0 0 65,000 281,000 16,024,000 14,866,000
Level 3 fair value measurements [Roll Forward]                          
Beginning balance   (15,426,000) (14,311,000) (14,760,000) (13,802,000)                
Total gain (realized/unrealized) included in earnings   (545,000) (758,000) (1,158,000) (1,231,000)                
Settlements   (53,000) 533,000 (106,000) 497,000                
Ending balance   (16,024,000) (14,536,000) (16,024,000) (14,536,000)                
Amount of total loss included in earnings attributable to the change in unrealized losses (gains) relating to assets and liabilities held   $ (545,000) $ (758,000) $ (1,158,000) $ (1,231,000)