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Components of accumulated other comprehensive loss (Tables) | 6 Months Ended
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Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Accumulated balances for each component of AOCI |
| June 30, 2016 | December 31, 2015
Defined benefit plan liabilities | $ | (119,405 | ) | $ | (121,910 | )
Unrealized loss on financial instruments | (1,528 | ) | (1,435 | )
Other comprehensive loss before income tax effect | (120,933 | ) | (123,345 | )
Income tax effect (1) | 9,930 |  | 10,695 |
Accumulated other comprehensive loss | $ | (111,003 | ) | $ | (112,650 | )
(1) The allocation of the income tax effect to the components of other comprehensive loss is as follows:
| June 30, 2016 | December 31, 2015
Defined benefit plan liabilities | $ | 10,461 |  | $ | 11,243 |
Unrealized loss on financial instruments | (531 | ) | (548 | )
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, 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, April 1, 2015 | $ | (115,735 | ) | $ | (1,869 | ) | $ | (117,604 | )
Other comprehensive income before reclassifications (1) | 18,042 |  | — |  | 18,042 |
Net amount reclassified to net loss | 1,358 |  | (38 | ) | 1,320 |
Balance, June 30, 2015 | $ | (96,335 | ) | $ | (1,907 | ) | $ | (98,242 | )
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 | )
Balance, December 31, 2014 | $ | (115,852 | ) | $ | (1,830 | ) | $ | (117,682 | )
Other comprehensive income before reclassifications (1) | 18,042 |  | — |  | 18,042 |
Net amount reclassified to net income | 1,475 |  | (77 | ) | 1,398 |
Balance, June 30, 2015 | $ | (96,335 | ) | $ | (1,907 | ) | $ | (98,242 | )
(1) The gain in other comprehensive income before reclassifications was due to a plan remeasurement related to labor negotiations, census and other actuarial adjustments.
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 | 2016 | 2015 | 2016 | 2015
Defined benefit plan and other postretirement liabilities | Cost of goods sold | $ | 778 |  | $ | 1,612 |  | $ | 1,555 |  | $ | 1,753 |
| Selling, general and administrative expenses | 125 |  | 136 |  | 250 |  | 503 |
| Other operating expense, net | 350 |  | — |  | 700 |  | — |
| Income tax expense | (391 | ) | (390 | ) | (782 | ) | (781 | )
| Net of tax | $ | 862 |  | $ | 1,358 |  | $ | 1,723 |  | $ | 1,475 |
Unrealized loss on financial instruments | Cost of goods sold | $ | (47 | ) | $ | (46 | ) | $ | (93 | ) | $ | (93 | )
| Income tax benefit | 9 |  | 8 |  | 17 |  | 16 |
| Net of tax | $ | (38 | ) | $ | (38 | ) | $ | (76 | ) | $ | (77 | )

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