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Postretirement benefits
 3 Months Ended
Mar. 31, 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 income and consisted of the following components:
Quarter Ended
March 31,
(in thousands)20232022
Interest cost$496 $280 
Expected return on plan assets(1,830)(1,866)
Amortization of prior service credit(355)(355)
Amortization of net actuarial losses568 225 
Net periodic benefit income$(1,121)$(1,716)