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Other comprehensive income (reclassification adjustments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reclassification adjustments [Line Items]
Total reclassifications, net of tax	$ (182)	$ (330)
Prior service credit [Member]
Reclassification adjustments [Line Items]
Amounts reclassified from accumulated other comprehensive loss	355	355
Net actuarial loss [Member]
Reclassification adjustments [Line Items]
Amounts reclassified from accumulated other comprehensive loss	(225)	(407)
Postretirement benefit plans [Member]
Reclassification adjustments [Line Items]
Amounts reclassified from accumulated other comprehensive loss	130	(52)
Tax benefit (expense)	(77)	(31)
Total reclassifications, net of tax	53	(83)
Realized loss on interest rate swap [Member]
Reclassification adjustments [Line Items]
Amounts reclassified from accumulated other comprehensive loss	(318)	(334)
Tax benefit (expense)	83	87
Total reclassifications, net of tax	$ (235)	$ (247)

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