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Components of accumulated other comprehensive loss (Tables)
 6 Months Ended
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated balances for each component of AOCI
 
June 30, 2017
 
December 31, 2016
Defined benefit plan liabilities
$
(124,180
)
 
$
(125,917
)
Unrealized loss on financial instruments
2,766

 
2,860

Other comprehensive loss before income tax effect
(121,414
)
 
(123,057
)
Income tax effect (1)
8,402

 
9,164

Accumulated other comprehensive loss
$
(113,012
)
 
$
(113,893
)

(1) The allocation of the income tax effect to the components of other comprehensive loss is as follows:
 
June 30, 2017
 
December 31, 2016
Defined benefit plan liabilities
$
8,955

 
$
9,736

Unrealized loss on financial instruments
(553
)
 
(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 gain (loss) on financial instruments
 
Total, net of tax
Balance, April 1, 2017
$
(115,431
)
 
$
2,250

 
$
(113,181
)
Net amount reclassified to net income
206

 
(37
)
 
169

Balance, June 30, 2017
$
(115,225
)
 
$
2,213

 
$
(113,012
)
 
 
 
 
 
 
Balance, April 1, 2016
$
(109,806
)
 
$
(2,021
)
 
$
(111,827
)
Net amount reclassified to net loss
862

 
(38
)
 
824

Balance, June 30, 2016
$
(108,944
)
 
$
(2,059
)
 
$
(111,003
)
 
 
 
 
 
 
Balance, December 31, 2016
$
(116,181
)
 
$
2,288

 
$
(113,893
)
Net amount reclassified to net loss
956

 
(75
)
 
881

Balance, June 30, 2017
$
(115,225
)
 
$
2,213

 
$
(113,012
)
 
 
 
 
 
 
Balance, December 31, 2015
$
(110,667
)
 
$
(1,983
)
 
$
(112,650
)
Net amount reclassified to net loss
1,723

 
(76
)
 
1,647

Balance, June 30, 2016
$
(108,944
)
 
$
(2,059
)
 
$
(111,003
)
Reclassification out of AOCI
Reclassifications out of AOCL were included in the consolidated statements of operations as follows:
 
 
 
 
For the three months ended June 30,
 
For the six months ended June 30,
AOCL Components
 
Location
 
2017
 
2016
 
2017
 
2016
Defined benefit plan and other postretirement liabilities
 
Cost of goods sold
 
$
(1,468
)
 
$
778

 
$
(161
)
 
$
1,555

 
 
Selling, general and administrative expenses
 
845

 
125

 
977

 
250

 
 
Other operating expense, net
 
528

 
350

 
922

 
700

 
 
Income tax effect
 
301

 
(391
)
 
(782
)
 
(782
)
 
 
Net of tax
 
$
206

 
$
862

 
$
956

 
$
1,723

 
 
 
 
 
 
 
 
 
 
 
Unrealized loss on financial instruments
 
Cost of goods sold
 
$
(47
)
 
$
(47
)
 
$
(94
)
 
$
(93
)
 
 
Income tax effect
 
10

 
9

 
19

 
17

 
 
Net of tax
 
$
(37
)
 
$
(38
)
 
$
(75
)
 
$
(76
)