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Other comprehensive income (loss) (reclassification adjustments) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Reclassifications from accumulated other comprehensive loss        
Prior service credit $ 355 $ 355 $ 1,066 $ 1,066
Net actuarial loss (568) (225) (1,705) (674)
Total amortization (213) 130 (639) 392
Tax benefit (expense) 17 (79) 49 (237)
Amortization of postretirement benefit plan items, net of tax (196) 51 (590) 155
Realized loss on debt securities 0 0 0 (8)
Tax benefit 0 0 0 2
Realized loss on debt securities, net of tax 0 0 0 (6)
Realized gain (loss) on cash flow hedges 984 53 2,191 (412)
Tax (expense) benefit (264) (15) (588) 109
Realized gain (loss) on cash flow hedges, net of tax 720 38 1,603 (303)
Currency translation adjustment 0 0 (863) (5,550)
Total reclassifications, net of tax $ 524 $ 89 $ 150 $ (5,704)