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Postretirement benefits | 9 Months Ended
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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) |  | 2022 |  | 2021 |  | 2022 |  | 2021
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 losses |  | 225 |  |  | 407 |  |  | 674 |  |  | 1,221 |
Net periodic benefit income |  | $ | (1,716) |  |  | $ | (1,581) |  |  | $ | (5,147) |  |  | $ | (4,742) |

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