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Other comprehensive income (loss) (reclassification adjustments) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Reclassifications from accumulated other comprehensive loss    
Prior service credit $ 355 $ 355
Net actuarial loss (334) (568)
Total amortization 21 (213)
Tax (expense) benefit (43) 16
Amortization of postretirement benefit plan items, net of tax (22) (197)
Realized gain on cash flow hedges 915 570
Tax expense (247) (152)
Realized gain on cash flow hedges, net of tax 668 418
Total reclassifications, net of tax $ 646 $ 221