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Components of accumulated other comprehensive loss - Reclassifications out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Cost of goods sold $ 359,243 $ 351,262 $ 1,074,520 $ 995,357
Selling, general and administrative expenses 13,994 9,733 34,048 29,303
Other operating expense - net 437 878 1,590 2,337
Income tax (expense) benefit 3,321 (848) 4,465 (3,237)
Net income (loss) (20,783) 58,273 (12,775) 83,951
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined benefit plan and other postretirement liabilities [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Cost of goods sold 983 777 821 2,332
Selling, general and administrative expenses 109 125 1,086 375
Other operating expense - net 383 350 1,306 1,050
Income tax (expense) benefit (391) (390) (1,173) (1,172)
Net income (loss) 1,084 862 2,040 2,585
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized gain (loss) on financial instruments [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Cost of goods sold (46) (46) (140) (139)
Income tax (expense) benefit 9 8 28 25
Net income (loss) $ (37) $ (38) $ (112) $ (114)