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Benefit Plans | 9 Months Ended
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Sep. 30, 2024
Retirement Benefits [Abstract] |
Benefit Plans | Benefit Plans We have a non-contributory defined benefit pension plan, as well as a supplemental executive retirement plan, that covered eligible employees through December 31, 2022. Effective January 1, 2023, these plans were frozen (no future benefits will be accrued for participants due to employment and no new participants will be added). Participants in these plans were fully vested in their benefits as of December 31, 2022. Tables 10.1 and 10.2 provide the components of net periodic benefit cost for our pension, supplemental executive retirement and other postretirement benefit plans for the three and nine months ended September 30, 2024 and 2023.
Components of net periodic benefit cost
Table | 10.1 |  |  |  |  |  |  |  |
|  | Three Months Ended September 30,
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefit Plans
(In thousands) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Company service cost |  | $ | — |  |  | $ | — |  |  | $ | 417 |  |  | $ | 374 |
Interest cost |  | 3,247 |  |  | 3,297 |  |  | 376 |  |  | 409 |
Expected return on plan assets |  | (3,644) |  |  | (3,426) |  |  | (2,493) |  |  | (2,059) |
Amortization of: |  |  |  |  |  |  |  |
Net actuarial losses (gains) |  | 522 |  |  | 529 |  |  | (382) |  |  | (38) |
Prior service cost (credit) |  | 87 |  |  | 87 |  |  | 454 |  |  | 465 |
Cost of settlements and curtailments |  | — |  |  | 334 |  |  | — |  |  | — |
Net periodic benefit cost (benefit) |  | $ | 212 |  |  | $ | 821 |  |  | $ | (1,628) |  |  | $ | (849) |
Components of net periodic benefit cost
Table | 10.2 |  |  |  |  |  |  |  |
|  | Nine Months Ended September 30,
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefit Plans
(In thousands) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Company service cost |  | $ | — |  |  | $ | — |  |  | $ | 1,251 |  |  | $ | 1,122 |
Interest cost |  | 9,741 |  |  | 10,278 |  |  | 1,126 |  |  | 1,225 |
Expected return on plan assets |  | (10,932) |  |  | (10,432) |  |  | (7,481) |  |  | (6,176) |
Amortization of: |  |  |  |  |  |  |  |
Net actuarial losses (gains) |  | 1,568 |  |  | 1,656 |  |  | (1,142) |  |  | (113) |
Prior service cost (credit) |  | 259 |  |  | 259 |  |  | 1,360 |  |  | 1,396 |
Cost of settlements and curtailments |  | — |  |  | 9,181 |  |  | — |  |  | — |
Net periodic benefit cost (benefit) |  | $ | 636 |  |  | $ | 10,942 |  |  | $ | (4,886) |  |  | $ | (2,546) |
In the first quarter of 2024, we made a contribution to our qualified pension plan of $23.0 million.

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