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Postretirement benefits
 6 Months Ended
Jun. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Postretirement benefits
We have historically provided certain health care benefits for a large number of 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 14: Postretirement Benefits” in the Notes to Consolidated Financial Statements appearing in the 2020 Form 10-K.

Postretirement benefit income is included in other income on the consolidated statements of comprehensive income (loss) and consisted of the following components:
Quarter Ended
June 30,		Six Months Ended
June 30,
(in thousands)2021202020212020
Interest cost$242 $478 $484 $956 
Expected return on plan assets(1,875)(1,905)(3,748)(3,809)
Amortization of prior service credit(355)(355)(711)(711)
Amortization of net actuarial losses407 575 814 1,150 
Net periodic benefit income$(1,581)$(1,207)$(3,161)$(2,414)