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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Cost of goods sold $ 515,149 $ 419,820 $ 1,008,965 $ 842,425
Selling, general and administrative expenses 10,012 10,618 21,983 20,680
Income tax expense 5,065 1,654 14,366 560
Net of tax (33,897) 20,344 39,882 240
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 1,612 25 1,753 616
Selling, general and administrative expenses 136 17 503 285
Income tax expense (390) (559) (781) (1,263)
Net of tax 1,358 (517) 1,475 (362)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Equity in investee other comprehensive income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Income tax expense 0 (17) 0 (34)
Net of tax 0 (17) 0 (34)
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) (46) (93) (93)
Income tax expense 8 9 16 17
Net of tax $ (38) $ (37) $ (77) $ (76)