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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

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