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Components of Accumulated other comprehensive loss (Tables)
 6 Months Ended
Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Components of Accumulated Other Comprehensive Loss
 
June 30, 2014
December 31, 2013
Defined benefit plan liabilities
$
(90,836
)
$
(92,177
)
Equity in investee other comprehensive income (1)
(12,650
)
(12,650
)
Unrealized loss on financial instruments
(1,157
)
(1,064
)
Other comprehensive loss before income tax effect
(104,643
)
(105,891
)
Income tax effect (2)
12,779

14,059

Accumulated other comprehensive loss
$
(91,864
)
$
(91,832
)
(1)
The amount includes our equity in the other comprehensive income of Mt. Holly.
(2)The allocation of the income tax effect to the components of other comprehensive income is as follows:
 
June 30, 2014
December 31, 2013
Defined benefit plan liabilities
$
12,993

$
14,256

Equity in investee other comprehensive income
384

418

Unrealized loss on financial instruments
(598
)
(615
)
Accumulated balances for each component of AOCI
The following table summarizes the changes in the accumulated balances for each component of accumulated other comprehensive loss ("AOCI"):
 
Defined benefit plan and other postretirement liabilities
Equity in investee other comprehensive income
Unrealized loss on financial instruments
Total, net of tax
Balance, April 1, 2014
$
(77,766
)
$
(12,249
)
$
(1,718
)
$
(91,733
)
Other comprehensive income (loss) before reclassifications
440

(17
)
—

423

Net amount reclassified to net income
(517
)
—

(37
)
(554
)
Balance, June 30, 2014
$
(77,843
)
$
(12,266
)
$
(1,755
)
$
(91,864
)
 
 
 
 
 
Balance, April 1, 2013
$
(136,491
)
$
(12,241
)
$
(1,565
)
$
(150,297
)
Other comprehensive income (loss) before reclassifications
10,349

(17
)
—

10,332

Net amount reclassified to net loss
840

—

(38
)
802

Balance, June 30, 2013
$
(125,302
)
$
(12,258
)
$
(1,603
)
$
(139,163
)
 
 
 
 
 
Balance, December 31, 2013
$
(77,921
)
$
(12,232
)
$
(1,679
)
$
(91,832
)
Other comprehensive income (loss) before reclassifications
440

(34
)
—

406

Net amount reclassified to net income
(362
)
—

(76
)
(438
)
Balance, June 30, 2014
$
(77,843
)
$
(12,266
)
$
(1,755
)
$
(91,864
)
 
 
 
 
 
Balance, December 31, 2012
$
(137,441
)
$
(12,224
)
$
(1,527
)
$
(151,192
)
Other comprehensive income (loss) before reclassifications
10,349

(34
)
—

10,315

Net amount reclassified to net loss
1,790

—

(76
)
1,714

Balance, June 30, 2013
$
(125,302
)
$
(12,258
)
$
(1,603
)
$
(139,163
)
Reclassification out of AOCI
Reclassifications out of AOCI were included in the consolidated statements of operations as follows:
 
 
For the three months ended June 30,
For the six months ended June 30,
AOCI Components
Location
2014
2013
2014
2013
Defined benefit plan and other postretirement liabilities
Cost of goods sold
$
25

$
910

$
616

$
1,994

 
Selling, general and administrative expenses
17

304

285

544

 
Income tax expense
(559
)
(374
)
(1,263
)
(748
)
 
Net of tax
$
(517
)
$
840

$
(362
)
$
1,790

 
 
 
 
 
 
Equity in investee other comprehensive income
Cost of goods sold
$
—

$
—

$
—

$
—

 
Income tax expense
(17
)
(17
)
(34
)
(34
)
 
Net of tax
$
(17
)
$
(17
)
$
(34
)
$
(34
)
 
 
 
 
 
 
Unrealized loss on financial instruments
Cost of goods sold
$
(46
)
$
(46
)
$
(93
)
$
(93
)
 
Income tax expense
9

8

17

17

 
Net of tax
$
(37
)
$
(38
)
$
(76
)
$
(76
)