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Components of Accumulated other comprehensive loss
 3 Months Ended
Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Components of Accumulated other comprehensive loss
Components of accumulated other comprehensive loss
 
March 31, 2013
December 31, 2012
Defined benefit plan liabilities
$
(151,902
)
$
(153,225
)
Equity in investee other comprehensive income (1)
(12,712
)
(12,712
)
Unrealized loss on financial instruments
(924
)
(878
)
Other comprehensive loss before income tax effect
(165,538
)
(166,815
)
Income tax effect (2)
15,241

15,623

Accumulated other comprehensive loss
$
(150,297
)
$
(151,192
)
(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:
 
March 31, 2013
December 31, 2012
Defined benefit plan liabilities
$
15,410

$
15,784

Equity in investee other comprehensive income
471

488

Unrealized loss on financial instruments
(640
)
(649
)