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Postretirement benefits (Tables)
3 Months Ended
Mar. 31, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Components of net periodic benefit income
Postretirement benefit income is included in other income on the consolidated statements of comprehensive income and consisted of the following components:
Quarter Ended
March 31,
(in thousands)20242023
Interest cost$435 $496 
Expected return on plan assets(2,099)(1,830)
Amortization of prior service credit(355)(355)
Amortization of net actuarial losses334 568 
Net periodic benefit income$(1,685)$(1,121)