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Other comprehensive income (reclassification adjustments) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Reclassifications from accumulated other comprehensive loss |  |
Prior service credit | $ 355 | $ 355
Net actuarial loss | (568) | (225)
Total amortization | (213) | 130
Tax benefit (expense) | 16 | (77)
Amortization of postretirement benefit plan items, net of tax | (197) | 53
Realized gain (loss) loss on cash flow hedges | 570 | (318)
Tax (expense) benefit | (152) | 83
Realized gain (loss) on cash flow hedges, net of tax | 418 | (235)
Total reclassifications, net of tax | $ 221 | $ (182)

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