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Postretirement benefits (Tables)
9 Months Ended
Sep. 30, 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, net on the consolidated statements of comprehensive income (loss) and consisted of the following components:
Quarter Ended
September 30,
Nine Months Ended
September 30,
(in thousands)2024202320242023
Interest cost$435 $496 $1,306 $1,489 
Expected return on plan assets(2,099)(1,830)(6,296)(5,490)
Amortization of prior service credit(355)(355)(1,066)(1,066)
Amortization of net actuarial losses334 568 1,001 1,705 
Net periodic benefit income$(1,685)$(1,121)$(5,055)$(3,362)