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Components of accumulated other comprehensive loss - Reclassifications out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Cost of goods sold $ 366,342 $ 321,172 $ 715,277 $ 643,078
Selling, general and administrative expenses 9,352 9,945 20,054 19,570
Other operating expense, net (180) (578) (1,153) (1,459)
Income tax (expense) benefit (1,452) 319 (1,144) 2,389
Net income (loss) 7,131 (9,515) (8,008) (25,678)
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 (1,468) 778 (161) 1,555
Selling, general and administrative expenses 845 125 977 250
Other operating expense, net 528 350 922 700
Income tax (expense) benefit 301 (391) (782) (782)
Net income (loss) 206 862 956 1,723
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 (47) (47) (94) (93)
Income tax (expense) benefit 10 9 19 17
Net income (loss) $ (37) $ (38) $ (75) $ (76)