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Postretirement benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net periodic benefit income
Interest cost	$ 496	$ 280
Expected return on plan assets	(1,830)	(1,866)
Amortization of prior service credit	(355)	(355)
Amortization of net actuarial losses	568	225
Net periodic benefit income	$ (1,121)	$ (1,716)

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