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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
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]                        
Beginning Balance $ (113,893)       $ (112,650)       $ (117,682) $ (112,650) $ (117,682) $ (91,832)
Other comprehensive income (loss) before reclassifications                   (9,521) 7,311 (43,345)
Net amount reclassified to net loss                   8,278 (2,279) 4,844
Elimination of equity in investee resulting from acquisition                       12,651
Ending Balance (113,181) $ (113,893)       $ (112,650)       (113,893) (112,650) (117,682)
Cost of goods sold 348,935       321,906         1,330,136 1,908,544 1,729,243
Helguvik impairment                   152,220 0 0
Selling, general and administrative expenses 10,702       9,625         40,264 42,115 49,195
Other operating expense, net (973)       (881)         (3,857) (7,436) (12,481)
Income tax benefit (expense) 308       2,070         (2,824) (9,276) (18,308)
Net income (loss) (15,139) (168,464) $ (58,273) $ (9,515) (16,163) (43,080) $ (56,112) $ (33,897) 73,779 (252,415) (59,310) 126,474
Defined benefit plan liabilities [Member]                        
AOCI Attributable to Parent, Net of Tax [Roll Forward]                        
Beginning Balance (116,181)       (110,667)       (115,852) (110,667) (115,852) (77,921)
Other comprehensive income (loss) before reclassifications                   (9,521) 7,311 (42,926)
Net amount reclassified to net loss 750       861         4,007 (2,126) 4,995
Elimination of equity in investee resulting from acquisition                       0
Ending Balance   (116,181)       (110,667)       (116,181) (110,667) (115,852)
Equity in investee other comprehensive income [Member]                        
AOCI Attributable to Parent, Net of Tax [Roll Forward]                        
Beginning Balance 0       0       0 0 0 (12,232)
Other comprehensive income (loss) before reclassifications                   0 0 (419)
Net amount reclassified to net loss                   0 0 0
Elimination of equity in investee resulting from acquisition                       12,651
Ending Balance   0       0       0 0 0
Gain (loss) on financial instruments [Member]                        
AOCI Attributable to Parent, Net of Tax [Roll Forward]                        
Beginning Balance 2,288       (1,983)       $ (1,830) (1,983) (1,830) (1,679)
Other comprehensive income (loss) before reclassifications                   0 0 0
Net amount reclassified to net loss (38)       (38)         4,271 (153) (151)
Elimination of equity in investee resulting from acquisition                       0
Ending Balance   $ 2,288       $ (1,983)       2,288 (1,983) (1,830)
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 1,307       777         3,464 (1,696) 6,237
Selling, general and administrative expenses 132       125         465 235 569
Other operating expense, net 394       350         1,585 904 0
Income tax benefit (expense) (1,083)       (391)         (1,507) (1,569) (1,811)
Net income (loss) 750       861         4,007 (2,126) 4,995
Reclassification out of Accumulated Other Comprehensive Income [Member] | Equity in investee other comprehensive income [Member]                        
AOCI Attributable to Parent, Net of Tax [Roll Forward]                        
Cost of goods sold                   0 0 0
Income tax benefit (expense)                   0 0 (419)
Net income (loss)                   0 0 (419)
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 (46)       (46)         (185) (186) (185)
Helguvik impairment                   4,480 0 0
Income tax benefit (expense) 8       8         (24) 33 34
Net income (loss) $ (38)       $ (38)         $ 4,271 $ (153) $ (151)