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Other comprehensive income (loss) (reclassification adjustments) (Details) - USD ($) $ in Thousands	3 Months Ended
	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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