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Components of accumulated other comprehensive loss - Reclassifications out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Cost of goods sold $ 321,906 $ 493,816
Selling, general and administrative expenses 9,625 11,971
Other operating expense, net (881) (2,079)
Income tax benefit (expense) 2,070 (9,301)
Net income (loss) (16,163) 73,779
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 777 325
Selling, general and administrative expenses 125 183
Other operating expense, net 350 0
Income tax benefit (expense) (391) (391)
Net income (loss) 861 117
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)
Income tax benefit (expense) 8 8
Net income (loss) $ (38) $ (39)