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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)