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Postretirement benefits | 6 Months Ended
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Jun. 30, 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 June 30, |  | Six Months Ended June 30,
(in thousands) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Interest cost |  | $ | 496 |  |  | $ | 280 |  |  | $ | 993 |  |  | $ | 561 |
Expected return on plan assets |  | (1,830) |  |  | (1,866) |  |  | (3,660) |  |  | (3,731) |
Amortization of prior service credit |  | (355) |  |  | (355) |  |  | (711) |  |  | (711) |
Amortization of net actuarial losses |  | 568 |  |  | 225 |  |  | 1,137 |  |  | 450 |
Net periodic benefit income |  | $ | (1,121) |  |  | $ | (1,716) |  |  | $ | (2,241) |  |  | $ | (3,431) |

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