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Components of Accumulated other comprehensive loss (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Unrealized loss on financial instruments $ (665) $ (682)
Defined benefit plan liabilities 16,564 17,311
Equity in investee other comprehensive income 523 558
Unrealized loss on financial instruments (871) (1,040)
Defined benefit plan liabilities (139,142) (142,259)
Equity in investee other comprehensive income (8,476) [1] (8,476) [1]
Other comprehensive loss before income tax effect (148,489) (151,775)
Income tax effect 16,422 [2] 17,187 [2]
Accumulated other comprehensive loss $ (132,067) $ (134,588)
[1] The amount includes our equity in the other comprehensive income of Mt. Holly Aluminum Company.
[2] June 30, 2012December 31, 2011Unrealized loss on financial instruments$(665)$(682)Defined benefit plan liabilities16,56417,311Equity in investee other comprehensive income523558