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Supplemental financial statement information - Changes in components of Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
AOCI Attributable to Parent, Net of Tax [Roll Forward]                      
Beginning Balance       $ (117,682)       $ (91,832) $ (117,682) $ (91,832) $ (151,192)
Other comprehensive income (loss) before reclassifications                 7,311 (43,345) 56,787
Elimination of equity in investee resulting from acquisition                   12,651  
Net amount reclassified to net income                 (2,279) 4,844 2,573
Ending Balance $ (112,650)       $ (117,682)       (112,650) (117,682) (91,832)
Cost of goods sold                 1,908,544 1,729,243 1,414,790
Selling, general and administrative expenses                 42,115 49,195 67,477
Other operating expense, net                 (356) 991 496
Income tax expense                 9,276 18,308 3,131
Net income (loss) (43,080) $ (56,112) $ (33,897) 73,779 75,829 $ 50,405 $ 20,344 (20,104) (59,310) 126,474 (40,313)
Defined benefit plan liabilities [Member]                      
AOCI Attributable to Parent, Net of Tax [Roll Forward]                      
Beginning Balance       (115,852)       (77,921) (115,852) (77,921) (137,441)
Other comprehensive income (loss) before reclassifications                 7,311 (42,926) 56,795
Elimination of equity in investee resulting from acquisition                   0  
Net amount reclassified to net income                 (2,126) 4,995 2,725
Ending Balance (110,667)       (115,852)       (110,667) (115,852) (77,921)
Equity in investee other comprehensive income [Member]                      
AOCI Attributable to Parent, Net of Tax [Roll Forward]                      
Beginning Balance       0       (12,232) 0 (12,232) (12,224)
Other comprehensive income (loss) before reclassifications                 0 (419) (8)
Elimination of equity in investee resulting from acquisition                   12,651  
Net amount reclassified to net income                 0 0 0
Ending Balance 0       0       0 0 (12,232)
Unrealized loss on financial instruments [Member]                      
AOCI Attributable to Parent, Net of Tax [Roll Forward]                      
Beginning Balance       $ (1,830)       $ (1,679) (1,830) (1,679) (1,527)
Other comprehensive income (loss) before reclassifications                 0 0 0
Elimination of equity in investee resulting from acquisition                   0  
Net amount reclassified to net income                 (153) (151) (152)
Ending Balance $ (1,983)       $ (1,830)       (1,983) (1,830) (1,679)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined benefit plan liabilities [Member]                      
AOCI Attributable to Parent, Net of Tax [Roll Forward]                      
Cost of goods sold                 (1,696) 6,237 3,264
Selling, general and administrative expenses                 235 569 990
Other operating expense, net                 904 0 0
Income tax expense                 (1,569) (1,811) (1,529)
Net income (loss)                 (2,126) 4,995 2,725
Reclassification out of Accumulated Other Comprehensive Income [Member] | Equity in investee other comprehensive income [Member]                      
AOCI Attributable to Parent, Net of Tax [Roll Forward]                      
Cost of goods sold                 0 0 0
Income tax expense                 0 (419) (70)
Net income (loss)                 0 (419) (70)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized loss on financial instruments [Member]                      
AOCI Attributable to Parent, Net of Tax [Roll Forward]                      
Cost of goods sold                 (186) (185) (186)
Income tax expense                 33 34 34
Net income (loss)                 $ (153) $ (151) $ (152)