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Components of Accumulated other comprehensive loss (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive loss before income tax effect | $ (105,079) |  | $ (105,891) |
Income tax effect | 13,346 |  | 14,059 |
Accumulated other comprehensive loss | (91,733) | (150,297) | (91,832) | (151,192)
Other comprehensive income (loss) before reclassifications | (17) | (17) |  |
Net amount reclassified to net loss | 116 | 912 |  |
Cost of goods sold | 422,605 | 303,692 |  |
Selling, general and administrative expenses | 10,062 | 16,299 |  |
Income tax benefit (expense) | (1,094) | 2,517 |  |
Net of tax | (20,104) | 8,253 |  |
Defined benefit plans liabilities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive loss before income tax effect | (91,318) |  | (92,177) |
Income tax effect | 13,552 |  | 14,256 |
Accumulated other comprehensive loss | (77,766) | (136,491) | (77,921) | (137,441)
Other comprehensive income (loss) before reclassifications | 0 | 0 |  |
Net amount reclassified to net loss | 155 | 950 |  |
Equity in investee other comprehensive income [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive loss before income tax effect | (12,650) |  | (12,650) |
Income tax effect | 401 |  | 418 |
Accumulated other comprehensive loss | (12,249) | (12,241) | (12,232) | (12,224)
Other comprehensive income (loss) before reclassifications | (17) | (17) |  |
Net amount reclassified to net loss | 0 | 0 |  |
Unrealized loss on financial instruments [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive loss before income tax effect | (1,111) |  | (1,064) |
Income tax effect | (607) |  | (615) |
Accumulated other comprehensive loss | (1,718) | (1,565) | (1,679) | (1,527)
Other comprehensive income (loss) before reclassifications | 0 | 0 |  |
Net amount reclassified to net loss | (39) | (38) |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined benefit plans liabilities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Cost of goods sold | 590 | 1,084 |  |
Selling, general and administrative expenses | 268 | 240 |  |
Income tax benefit (expense) | (703) | (374) |  |
Net of tax | 155 | 950 |  |
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 |  |
Income tax benefit (expense) | (17) | (17) |  |
Net of tax | (17) | (17) |  |
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 | (47) | (46) |  |
Income tax benefit (expense) | 8 | 8 |  |
Net of tax | $ (39) | $ (38) |  |

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