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Postretirement benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Net periodic benefit income
Interest cost	$ 397	$ 435
Expected return on plan assets	(2,137)	(2,099)
Amortization of prior service credit	(355)	(355)
Amortization of net actuarial losses	212	334
Net periodic benefit income	$ (1,883)	$ (1,685)

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