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Other comprehensive income (loss) (reclassification adjustments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Amounts reclassified from accumulated other comprehensive loss |  |  |  |
Prior service credit | $ 355 | $ 355 | $ 1,066 | $ 1,066
Net actuarial loss | (212) | (334) | (636) | (1,001)
Total amortization | 143 | 21 | 430 | 65
Tax expense | (74) | (44) | (226) | (133)
Amortization of postretirement benefit plan items, net of tax | 69 | (23) | 204 | (68)
Realized gain on cash flow hedges | 0 | 830 | 0 | 2,640
Tax expense | 0 | (223) | 0 | (712)
Realized gain on cash flow hedges, net of tax | 0 | 607 | 0 | 1,928
Total reclassifications, net of tax | $ 69 | $ 584 | $ 204 | $ 1,860

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