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Other comprehensive income (loss) - Change in accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Foreign Currency Translation          
Beginning Balance $ (70,165) $ (70,685) $ (67,307) $ (71,254)  
Other comprehensive income 5,998 2,726 3,140 3,295  
Net change 5,998 2,726 3,140 3,295  
Ending Balance (64,167) (67,959) (64,167) (67,959)  
Adjustment of pension and postretirement benefit plans          
Beginning Balance (155,281) (191,814) (158,994) (195,056)  
Other comprehensive income before reclassifications 0 0 1,269 0  
Amounts reclassified from accumulated other comprehensive loss for amortization of net losses 2,444 3,242 4,888 6,484  
Net change 2,444 3,242 6,157 6,484  
Ending Balance (152,837) (188,572) (152,837) (188,572)  
Unrealized net holding (losses) gains on debt securities          
Beginning Balance (1,171,950) 90,955 (96,120) 460,900  
Other comprehensive (loss) income (563,420) 73,027 (1,639,250) (296,918)  
Net change (563,420) 73,027 (1,639,250) (296,918)  
Ending Balance (1,735,370) 163,982 (1,735,370) 163,982  
Unrealized net losses on cash flow hedges          
Beginning Balance 158 (3,194) (2,648) (4,599)  
Other comprehensive (loss) income before reclassifications (332) (230) 2,807 1,127  
Amounts reclassified from accumulated other comprehensive loss (468) 282 (801) 330  
Net change (800) 52 2,006 1,457  
Ending Balance (642) (3,142) (642) (3,142)  
Accumulated other comprehensive loss, net of tax $ (1,953,016) $ (95,691) $ (1,953,016) $ (95,691) $ (325,069)