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Postretirement benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net periodic benefit income
Interest cost	$ 242	$ 478
Expected return on plan assets	(1,875)	(1,905)
Amortization of prior service credit	(355)	(355)
Amortization of net actuarial losses	407	575
Net periodic benefit income	$ (1,581)	$ (1,207)

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