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Components of Accumulated other comprehensive loss (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Defined benefit plan liabilities $ (140,338) $ (153,225)
Equity in investee other comprehensive income (12,712) [1] (12,712) [1]
Unrealized loss on financial instruments (971) (878)
Other comprehensive loss before income tax effect (154,021) (166,815)
Income tax effect 14,858 [2] 15,623 [2]
Accumulated other comprehensive loss (139,163) (151,192)
Defined benefit plan liabilities 15,037 15,784
Equity in investee other comprehensive income 453 488
Unrealized loss on financial instruments $ (632) $ (649)
[1] The amount includes our equity in the other comprehensive income of Mt. Holly Aluminum Company.
[2] )The allocation of the income tax effect to the components of other comprehensive income is as follows: June 30, 2013December 31, 2012Defined benefit plan liabilities$15,037$15,784Equity in investee other comprehensive income453488Unrealized loss on financial instruments(632)(649)