Other comprehensive income (reclassification adjustments) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Reclassifications from accumulated other comprehensive loss
Prior service credit	$ 355	$ 355	$ 711	$ 711
Net actuarial loss	(568)	(225)	(1,137)	(450)
Total amortization	(213)	130	(426)	261
Tax benefit (expense)	16	(79)	32	(157)
Amortization of postretirement benefit plan items, net of tax	(197)	51	(394)	104
Realized loss on debt securities	0	(8)	0	(8)
Tax benefit	0	2	0	2
Realized loss on debt securities, net of tax	0	(6)	0	(6)
Realized gain (loss) on cash flow hedges	634	(144)	1,204	(464)
Tax (expense) benefit	(169)	38	(321)	123
Realized gain (loss) on cash flow hedges, net of tax	465	(106)	883	(341)
Foreign currency translation adjustment	863	5,550	863	5,550
Total reclassifications, net of tax	$ (595)	$ (5,611)	$ (374)	$ (5,793)

Reclassification adjustments from accumulated other comprehensive income

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