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Other comprehensive income (loss) - Disclosure of accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Foreign Currency Translation          
Beginning Balance $ (51,174) $ (42,941) $ (49,936) $ (43,034)  
Other comprehensive loss before reclassifications (1,204) (3,456) (2,442) (3,363)  
Net change (1,204) (3,456) (2,442) (3,363)  
Ending Balance (52,378) (46,397) (52,378) (46,397)  
Adjustment of pension and postretirement benefit plans          
Beginning Balance (200,163) (202,652) (203,836) (205,408)  
Amounts reclassified from accumulated other comprehensive income (loss) for amortization of net losses 3,672 3,286 7,345 6,571  
Amounts reclassified from accumulated other comprehensive income (loss) for amortization of prior service credit 0 529 0 1,058  
Net change 3,672 2,757 7,345 5,513  
Ending Balance (196,491) (199,895) (196,491) (199,895)  
Unrealized net holding losses on debt securities          
Beginning Balance (72,408) (217,179) (173,811) (102,775)  
Other comprehensive (loss) income before reclassifications 130,452 (33,243) 231,855 (147,647)  
Net change 130,452 (33,243) 231,855 (147,647)  
Ending Balance 58,044 (250,422) 58,044 (250,422)  
Unrealized holding gains on equity securities          
Beginning Balance 0 0 0 605  
Reclassification to retained earnings due to cumulative effect of accounting change 0 0 0 (605)  
Net change 0 0 0 (605)  
Ending Balance 0 0 0 0  
Unrealized net (losses) gain on cash flow hedges          
Beginning Balance (234) (66) (391) (40)  
Reclassification to retained earnings due to cumulative effect of accounting change 0 0 (50) 0  
Other comprehensive income (loss) before reclassification (711) (165) (1,148) 582  
Amounts reclassified from other accumulated other comprehensive income (loss) 557 153 1,201 (620)  
Net change (154) (12) 3 (38)  
Ending Balance (388) (78) (388) (78)  
Accumulated other comprehensive (loss) income $ (191,213) $ (496,792) $ (191,213) $ (496,792) $ (427,974)