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Components of accumulated other comprehensive loss (Tables)
 3 Months Ended
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated balances for each component of AOCI
 
March 31, 2017
December 31, 2016
Defined benefit plan liabilities
$
(124,085
)
$
(125,917
)
Unrealized loss on financial instruments
2,814

2,860

Other comprehensive loss before income tax effect
(121,271
)
(123,057
)
Income tax effect (1)
8,090

9,164

Accumulated other comprehensive loss
$
(113,181
)
$
(113,893
)

(1) The allocation of the income tax effect to the components of other comprehensive loss is as follows:
 
March 31, 2017
December 31, 2016
Defined benefit plan liabilities
$
8,654

$
9,736

Unrealized loss on financial instruments
(564
)
(572
)


The following table summarizes the changes in the accumulated balances for each component of accumulated other comprehensive loss ("AOCL"):
 
Defined benefit plan and other postretirement liabilities
Unrealized loss on financial instruments
Total, net of tax
Balance, December 31, 2016
$
(116,181
)
$
2,288

$
(113,893
)
Net amount reclassified to net loss
750

(38
)
712

Balance, March 31, 2017
$
(115,431
)
$
2,250

$
(113,181
)
 
 
 
 
Balance, December 31, 2015
$
(110,667
)
$
(1,983
)
$
(112,650
)
Net amount reclassified to net loss
861

(38
)
823

Balance, March 31, 2016
$
(109,806
)
$
(2,021
)
$
(111,827
)
Reclassification out of AOCI
Reclassifications out of AOCL were included in the consolidated statements of operations as follows:
 
 
For the three months ended March 31
AOCL Components
Location
2017
2016
Defined benefit plan and other postretirement liabilities
Cost of goods sold
$
1,307

$
777

 
Selling, general and administrative expenses
132

125

 
Other operating expense, net
394

350

 
Income tax expense
(1,083
)
(391
)
 
Net of tax
$
750

$
861

 
 
 
 
Unrealized loss on financial instruments
Cost of goods sold
$
(46
)
$
(46
)
 
Income tax benefit
8

8

 
Net of tax
$
(38
)
$
(38
)