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Postretirement benefits
 9 Months Ended
Sep. 30, 2022
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 13: Postretirement Benefits” in the Notes to Consolidated Financial Statements appearing in the 2021 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
September 30,		Nine Months Ended
September 30,
(in thousands)2022202120222021
Interest cost$280 $242 $841 $726 
Expected return on plan assets(1,866)(1,875)(5,596)(5,623)
Amortization of prior service credit(355)(355)(1,066)(1,066)
Amortization of net actuarial losses225 407 674 1,221 
Net periodic benefit income$(1,716)$(1,581)$(5,147)$(4,742)