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Components of Accumulated other comprehensive loss (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Unrealized loss on financial instruments $ (1,061) $ (1,040)
Defined benefit plan liabilities (141,100) (142,259)
Equity in investee other comprehensive income (8,476) [1] (8,476) [1]
Other comprehensive loss before income tax effect (150,637) (151,775)
Income tax effect 16,805 17,187
Accumulated other comprehensive loss $ (133,832) $ (134,588)
[1] The amount includes our equity in the other comprehensive income of Mt. Holly Aluminum Company.