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Postretirement benefits | 6 Months Ended
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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) |  | 2021 |  | 2020 |  | 2021 |  | 2020
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 losses |  | 407 |  |  | 575 |  |  | 814 |  |  | 1,150 |
Net periodic benefit income |  | $ | (1,581) |  |  | $ | (1,207) |  |  | $ | (3,161) |  |  | $ | (2,414) |

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