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Other comprehensive income (loss) - Change in accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Foreign Currency Translation      
Beginning Balance $ (71,254) $ (56,783) $ (49,936)
Other comprehensive income (loss) before reclassifications 3,947 (14,471) (6,847)
Net change 3,947 (14,471) (6,847)
Ending Balance (67,307) (71,254) (56,783)
Adjustment of pension and postretirement benefit plans      
Beginning Balance (195,056) (202,816) (203,836)
Other comprehensive income (loss) before reclassification 23,094 (5,645) (13,671)
Amounts reclassified from accumulated other comprehensive loss for amortization of net losses 12,968 13,405 14,691
Net change 36,062 7,760 1,020
Ending Balance (158,994) (195,056) (202,816)
Unrealized net holding gains (losses) on debt securities      
Beginning Balance 460,900 92,155 (173,811)
Other comprehensive (loss) income before reclassifications (557,002) 368,780 265,950
Amounts reclassified from accumulated other comprehensive income (loss) for (gains) loss on securities (18) (35) 16
Net change (557,020) 368,745 265,966
Ending Balance (96,120) 460,900 92,155
Unrealized net (losses) gain on cash flow hedges      
Beginning Balance (4,599) (2,494) (391)
Reclassification to retained earnings due to cumulative effect of accounting change 0 0 (50)
Other comprehensive income (loss) before reclassifications 367 (6,400) (4,439)
Amounts reclassified from other accumulated other comprehensive loss 1,584 4,295 2,386
Net change 1,951 (2,105) (2,103)
Ending Balance (2,648) (4,599) (2,494)
Accumulated other comprehensive (loss) income, net of tax $ (325,069) $ 189,991 $ (169,938)