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Accumulated other comprehensive loss - Reclassifications out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, before tax	$ 859	$ 1,498	$ 3,697	$ 4,493
Income tax effect	(363)	(386)	(1,089)	(1,160)
Total reclassifications, net of tax	496	1,112	2,608	3,333
Amortization of prior service (credit) cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, before tax	(59)	23	(176)	68
Amortization of actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, before tax	1,478	1,475	4,433	4,425
Foreign currency
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, before tax	$ (560)	$ 0	$ (560)	$ 0

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