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Components of Accumulated other comprehensive loss (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss before income tax effect | $ (104,643) |  |  | $ (104,643) |  |  |  | $ (105,891) |  |  |
Income tax effect | 12,779 | [1] |  | 12,779 | [1] |  |  | 14,059 | [1] |  |
Accumulated other comprehensive loss | (91,864) |  | (139,163) | (91,864) |  | (139,163) | (91,733) | (91,832) |  | (150,297) | (151,192)
Other comprehensive income (loss) before reclassifications | 423 |  | 10,332 | 406 |  | 10,315 |  |  |  |  |
Net amount reclassified to net income (loss) | (554) |  | 802 | (438) |  | 1,714 |  |  |  |  |
Cost of goods sold | 419,820 |  | 337,635 | 842,425 |  | 641,327 |  |  |  |  |
Selling, general and administrative expenses | 10,618 |  | 15,154 | 20,680 |  | 31,453 |  |  |  |  |
Income tax benefit (expense) | 1,654 |  | 813 | 560 |  | 3,330 |  |  |  |  |
Net of tax | 20,344 |  | (29,384) | 240 |  | (21,131) |  |  |  |  |
Defined benefit plans liabilities [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss before income tax effect | (90,836) |  |  | (90,836) |  |  |  | (92,177) |  |  |
Income tax effect | 12,993 |  |  | 12,993 |  |  |  | 14,256 |  |  |
Accumulated other comprehensive loss | (77,843) |  | (125,302) | (77,843) |  | (125,302) | (77,766) | (77,921) |  | (136,491) | (137,441)
Other comprehensive income (loss) before reclassifications | 440 |  | 10,349 | 440 |  | 10,349 |  |  |  |  |
Net amount reclassified to net income (loss) | (517) |  | 840 | (362) |  | 1,790 |  |  |  |  |
Equity in investee other comprehensive income [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss before income tax effect | (12,650) | [2] |  | (12,650) | [2] |  |  | (12,650) | [2] |  |
Income tax effect | 384 |  |  | 384 |  |  |  | 418 |  |  |
Accumulated other comprehensive loss | (12,266) |  | (12,258) | (12,266) |  | (12,258) | (12,249) | (12,232) |  | (12,241) | (12,224)
Other comprehensive income (loss) before reclassifications | (17) |  | (17) | (34) |  | (34) |  |  |  |  |
Net amount reclassified to net income (loss) | 0 |  | 0 | 0 |  | 0 |  |  |  |  |
Unrealized loss on financial instruments [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss before income tax effect | (1,157) |  |  | (1,157) |  |  |  | (1,064) |  |  |
Income tax effect | (598) |  |  | (598) |  |  |  | (615) |  |  |
Accumulated other comprehensive loss | (1,755) |  | (1,603) | (1,755) |  | (1,603) | (1,718) | (1,679) |  | (1,565) | (1,527)
Other comprehensive income (loss) before reclassifications | 0 |  | 0 | 0 |  | 0 |  |  |  |  |
Net amount reclassified to net income (loss) | (37) |  | (38) | (76) |  | (76) |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined benefit plans liabilities [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of goods sold | 25 |  | 910 | 616 |  | 1,994 |  |  |  |  |
Selling, general and administrative expenses | 17 |  | 304 | 285 |  | 544 |  |  |  |  |
Income tax benefit (expense) | (559) |  | (374) | (1,263) |  | (748) |  |  |  |  |
Net of tax | (517) |  | 840 | (362) |  | 1,790 |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Equity in investee other comprehensive income [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of goods sold | 0 |  | 0 | 0 |  | 0 |  |  |  |  |
Income tax benefit (expense) | (17) |  | (17) | (34) |  | (34) |  |  |  |  |
Net of tax | (17) |  | (17) | (34) |  | (34) |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized loss on financial instruments [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of goods sold | (46) |  | (46) | (93) |  | (93) |  |  |  |  |
Income tax benefit (expense) | 9 |  | 8 | 17 |  | 17 |  |  |  |  |
Net of tax | $ (37) |  | $ (38) | $ (76) |  | $ (76) |  |  |  |  |
[1] | The allocation of the income tax effect to the components of other comprehensive income is as follows: June 30, 2014December 31, 2013Defined benefit plan liabilities$12,993$14,256Equity in investee other comprehensive income384418Unrealized loss on financial instruments(598)(615)
[2] | The amount includes our equity in the other comprehensive income of Mt. Holly.

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