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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Cost of goods sold $ 496,963 $ 424,918 $ 1,505,928 $ 1,267,343
Selling, general and administrative expenses 11,566 12,146 33,549 32,826
Income tax expense (2,161) 6,444 12,205 7,004
Net of tax (56,112) 50,405 (16,230) 50,645
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 669 308 2,422 924
Selling, general and administrative expenses 252 142 755 427
Income tax expense (392) (548) (1,173) (1,811)
Net of tax 529 (98) 2,004 (460)
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 (47) (46) (140) (139)
Income tax expense 8 8 24 25
Net of tax $ (39) $ (38) $ (116) $ (114)