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Other comprehensive income (loss) - Change in accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Foreign Currency Translation      
Beginning Balance $ (67,307) $ (71,254)  
Other comprehensive (loss) income (2,858) 569  
Net change (2,858) 569  
Ending Balance (70,165) (70,685)  
Adjustment of pension and postretirement benefit plans      
Beginning Balance (158,994) (195,056)  
Other comprehensive loss before reclassification 1,269 0  
Amounts reclassified from accumulated other comprehensive loss for amortization of net losses 2,444 3,242  
Net change 3,713 3,242  
Ending Balance (155,281) (191,814)  
Unrealized net holding (losses) gains on debt securities      
Beginning Balance (96,120) 460,900  
Other comprehensive loss (1,075,830) (369,945)  
Net change (1,075,830) (369,945)  
Ending Balance (1,171,950) 90,955  
Unrealized net gains (losses) on cash flow hedges      
Beginning Balance (2,648) (4,599)  
Other comprehensive income before reclassifications 3,139 1,357  
Amounts reclassified from accumulated other comprehensive gains (losses) (333) 48  
Net change 2,806 1,405  
Ending Balance 158 (3,194)  
Accumulated other comprehensive loss, net of tax $ (1,397,238) $ (174,738) $ (325,069)