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Components of accumulated other comprehensive loss (Tables) | 9 Months Ended
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Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Accumulated balances for each component of AOCI |
| September 30, 2017 |  | December 31, 2016
Defined benefit plan liabilities | $ | (122,705 | ) |  | $ | (125,917 | )
Unrealized loss on financial instruments | 2,720 |  |  | 2,860 |
Other comprehensive loss before income tax effect | (119,985 | ) |  | (123,057 | )
Income tax effect (1) | 8,020 |  |  | 9,164 |
Accumulated other comprehensive loss | $ | (111,965 | ) |  | $ | (113,893 | )
(1) The allocation of the income tax effect to the components of other comprehensive loss is as follows:
| September 30, 2017 |  | December 31, 2016
Defined benefit plan liabilities | $ | 8,564 |  |  | $ | 9,736 |
Unrealized loss on financial instruments | (544 | ) |  | (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, July 1, 2017 | $ | (115,225 | ) |  | $ | 2,213 |  |  | $ | (113,012 | )
Net amount reclassified to net income | 1,084 |  |  | (37 | ) |  | 1,047 |
Balance, September 30, 2017 | $ | (114,141 | ) |  | $ | 2,176 |  |  | $ | (111,965 | )
Balance, July 1, 2016 | $ | (108,944 | ) |  | $ | (2,059 | ) |  | $ | (111,003 | )
Net amount reclassified to net loss | 862 |  |  | (38 | ) |  | 824 |
Balance, September 30, 2016 | $ | (108,082 | ) |  | $ | (2,097 | ) |  | $ | (110,179 | )
Balance, December 31, 2016 | $ | (116,181 | ) |  | $ | 2,288 |  |  | $ | (113,893 | )
Net amount reclassified to net loss | 2,040 |  |  | (112 | ) |  | 1,928 |
Balance, September 30, 2017 | $ | (114,141 | ) |  | $ | 2,176 |  |  | $ | (111,965 | )
Balance, December 31, 2015 | $ | (110,667 | ) |  | $ | (1,983 | ) |  | $ | (112,650 | )
Net amount reclassified to net loss | 2,585 |  |  | (114 | ) |  | 2,471 |
Balance, September 30, 2016 | $ | (108,082 | ) |  | $ | (2,097 | ) |  | $ | (110,179 | )
Reclassification out of AOCI | Reclassifications out of AOCL were included in the consolidated statements of operations as follows:
|  |  |  | For the three months ended September 30, |  | For the nine months ended September 30,
AOCL Components |  | Location |  | 2017 |  | 2016 |  | 2017 |  | 2016
Defined benefit plan and other postretirement liabilities |  | Cost of goods sold |  | $ | 983 |  |  | $ | 777 |  |  | $ | 821 |  |  | $ | 2,332 |
|  | Selling, general and administrative expenses |  | 109 |  |  | 125 |  |  | 1,086 |  |  | 375 |
|  | Other operating expense, net |  | 383 |  |  | 350 |  |  | 1,306 |  |  | 1,050 |
|  | Income tax effect |  | (391 | ) |  | (390 | ) |  | (1,173 | ) |  | (1,172 | )
|  | Net of tax |  | $ | 1,084 |  |  | $ | 862 |  |  | $ | 2,040 |  |  | $ | 2,585 |
Unrealized loss on financial instruments |  | Cost of goods sold |  | $ | (46 | ) |  | $ | (46 | ) |  | $ | (140 | ) |  | $ | (139 | )
|  | Income tax effect |  | 9 |  |  | 8 |  |  | 28 |  |  | 25 |
|  | Net of tax |  | $ | (37 | ) |  | $ | (38 | ) |  | $ | (112 | ) |  | $ | (114 | )

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