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Postretirement benefits
 9 Months Ended
Sep. 30, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Postretirement benefits
We have historically provided certain health care benefits for eligible retired U.S. employees. In addition to our retiree health care plan, we also have a U.S. supplemental executive retirement plan. Further information regarding our postretirement benefit plans can be found under the caption “Note 12: Postretirement Benefits” in the Notes to Consolidated Financial Statements appearing in the 2022 Form 10-K.

Postretirement benefit income is included in other income on the consolidated statements of comprehensive (loss) income and consisted of the following components:
Quarter Ended
September 30,		Nine Months Ended
September 30,
(in thousands)2023202220232022
Interest cost$496 $280 $1,489 $841 
Expected return on plan assets(1,830)(1,866)(5,490)(5,596)
Amortization of prior service credit(355)(355)(1,066)(1,066)
Amortization of net actuarial losses568 225 1,705 674 
Net periodic benefit income$(1,121)$(1,716)$(3,362)$(5,147)