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Other comprehensive income (loss) (reclassification adjustments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reclassification adjustments [Line Items]
Total reclassifications, net of tax	$ (356)	$ (449)	$ (1,012)	$ (1,004)
Prior service credit [Member]
Reclassification adjustments [Line Items]
Amounts reclassified from accumulated other comprehensive loss	355	355	1,066	1,066
Net actuarial loss [Member]
Reclassification adjustments [Line Items]
Amounts reclassified from accumulated other comprehensive loss	(407)	(575)	(1,221)	(1,725)
Postretirement benefit plans [Member]
Reclassification adjustments [Line Items]
Amounts reclassified from accumulated other comprehensive loss	(52)	(220)	(155)	(659)
Tax (expense) benefit	(30)	12	(93)	35
Total reclassifications, net of tax	(82)	(208)	(248)	(624)
Realized loss on interest rate swap [Member]
Reclassification adjustments [Line Items]
Amounts reclassified from accumulated other comprehensive loss	(371)	(326)	(1,035)	(514)
Tax (expense) benefit	97	85	271	134
Total reclassifications, net of tax	$ (274)	$ (241)	$ (764)	$ (380)

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