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Components of Accumulated other comprehensive loss (Tables)
 6 Months Ended
Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Components of Accumulated Other Comprehensive Loss
 
 
 
 
June 30, 2012
December 31, 2011
Unrealized loss on financial instruments
$
(871
)
$
(1,040
)
Defined benefit plan liabilities
(139,142
)
(142,259
)
Equity in investee other comprehensive income (1)
(8,476
)
(8,476
)
Other comprehensive loss before income tax effect
(148,489
)
(151,775
)
Income tax effect (2)
16,422

17,187

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)The allocation of the income tax effect to the components of other comprehensive income is as follows:
 
June 30, 2012
December 31, 2011
Unrealized loss on financial instruments
$
(665
)
$
(682
)
Defined benefit plan liabilities
16,564

17,311

Equity in investee other comprehensive income
523

558