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Other comprehensive income (loss) (reclassification adjustments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Amounts reclassified from accumulated other comprehensive loss |  |  |  |
Prior service credit | $ 355 | $ 355 | $ 711 | $ 711
Net actuarial loss | (212) | (334) | (424) | (667)
Total amortization | 143 | 21 | 287 | 44
Tax expense | (76) | (44) | (152) | (89)
Amortization of postretirement benefit plan items, net of tax | 67 | (23) | 135 | (45)
Realized gain on cash flow hedges | 0 | 895 | 0 | 1,810
Tax expense | 0 | (242) | 0 | (489)
Realized gain on cash flow hedges, net of tax | 0 | 653 | 0 | 1,321
Total reclassifications, net of tax | $ 67 | $ 630 | $ 135 | $ 1,276

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