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Accumulated Other Comprehensive Loss (AOCL) - Changes in components of Accumulated other comprehensive loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, start |  |  |  | $ 756,655 |  |  |  | $ 1,008,811 | $ 756,655 | $ 1,008,811 | $ 1,096,068
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  | 20,204 | (9,521) | 7,311
Net amount reclassified to net loss |  |  |  |  |  |  |  |  | 1,947 | 8,278 | (2,279)
Balance, end | $ 829,643 |  |  |  | $ 756,655 |  |  |  | 829,643 | 756,655 | 1,008,811
Cost of goods sold |  |  |  |  |  |  |  |  | 1,460,475 | 1,330,136 | 1,908,544
Helguvik (gains) losses |  |  |  |  |  |  |  |  |  | 152,220 |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 45,446 | 40,264 | 42,115
Other operating expense, net |  |  |  |  |  |  |  |  | (2,111) | (3,857) | (7,436)
Income tax (expense) benefit |  |  |  |  |  |  |  |  | (7,583) | (2,824) | (9,276)
Net income (loss) | 35,805 | $ 20,783 | $ 7,131 | (15,139) | (168,464) | $ (58,273) | $ (9,515) | (16,163) | 48,580 | (252,415) | (59,310)
Defined benefit plan liabilities [Member] |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, start |  |  |  | (116,181) |  |  |  | (110,667) | (116,181) | (110,667) | (115,852)
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  | 20,204 | (9,521) | 7,311
Net amount reclassified to net loss |  |  |  |  |  |  |  |  | (2,097) | (4,007) | 2,126
Balance, end | (93,880) |  |  |  | (116,181) |  |  |  | (93,880) | (116,181) | (110,667)
Gain (loss) on financial instruments [Member] |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, start |  |  |  | 2,288 |  |  |  | (1,983) | 2,288 | (1,983) | (1,830)
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net amount reclassified to net loss |  |  |  |  |  |  |  |  | 150 | (4,271) | 153
Balance, end | 2,138 |  |  |  | 2,288 |  |  |  | 2,138 | 2,288 | (1,983)
Accumulated other comprehensive loss [Member] |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, start |  |  |  | $ (113,893) |  |  |  | $ (112,650) | (113,893) | (112,650) | (117,682)
Balance, end | $ (91,742) |  |  |  | $ (113,893) |  |  |  | (91,742) | (113,893) | (112,650)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined benefit plan liabilities [Member] |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  | 3,075 | 3,464 | (1,696)
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | (429) | 465 | 235
Other operating expense, net |  |  |  |  |  |  |  |  | 1,015 | 1,585 | 904
Income tax (expense) benefit |  |  |  |  |  |  |  |  | (1,564) | (1,507) | (1,569)
Net income (loss) |  |  |  |  |  |  |  |  | 2,097 | 4,007 | (2,126)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gain (loss) on financial instruments [Member] |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  | (186) | (185) | (186)
Helguvik (gains) losses |  |  |  |  |  |  |  |  | 0 | 4,480 | 0
Income tax (expense) benefit |  |  |  |  |  |  |  |  | 36 | (24) | 33
Net income (loss) |  |  |  |  |  |  |  |  | $ (150) | $ 4,271 | $ (153)

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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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