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Postretirement benefits
 9 Months Ended
Sep. 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
September 30,		Nine Months Ended
September 30,
(in thousands)2021202020212020
Interest cost$242 $478 $726 $1,434 
Expected return on plan assets(1,875)(1,905)(5,623)(5,714)
Amortization of prior service credit(355)(355)(1,066)(1,066)
Amortization of net actuarial losses407 575 1,221 1,725 
Net periodic benefit income$(1,581)$(1,207)$(4,742)$(3,621)