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Other comprehensive income (loss) (reclassification adjustments) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Amounts reclassified from accumulated other comprehensive loss |  |
Prior service credit | $ 355 | $ 355
Net actuarial loss | (212) | (334)
Total amortization | 143 | 21
Tax expense | (75) | (43)
Amortization of postretirement benefit plan items, net of tax | 68 | (22)
Realized gain on cash flow hedges | 0 | 915
Tax expense | 0 | (247)
Realized gain on cash flow hedges, net of tax | 0 | 668
Total reclassifications, net of tax | $ 68 | $ 646

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