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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Cost of goods sold $ 351,262 $ 496,963 $ 995,357 $ 1,505,928
Selling, general and administrative expenses 9,733 11,566 29,303 33,549
Other operating expense, net (878) (1,537) (2,337) (6,217)
Income tax benefit (expense) 848 2,161 3,237 (12,205)
Net loss (58,273) (56,112) (83,951) (16,230)
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 777 669 2,332 2,422
Selling, general and administrative expenses 125 252 375 755
Other operating expense, net 350 0 1,050 0
Income tax benefit (expense) (390) (392) (1,172) (1,173)
Net loss 862 529 2,585 2,004
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized loss on financial instruments [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Cost of goods sold (46) (47) (139) (140)
Income tax benefit (expense) 8 8 25 24
Net loss $ (38) $ (39) $ (114) $ (116)