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Pension and Other Postretirement Employee Benefits | 9 Months Ended
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Sep. 30, 2024
Retirement Benefits, Description [Abstract] |
Pension and Other Postretirement Employee Benefits | NO TE 11. PENSION AND OTHER POSTRETIREMENT EMPLOYEE BENEFITS The following table details the components of net periodic cost (benefit) of our pension plans and other postretirement employee benefit plans (OPEB):
|  | Three Months Ended September 30, |
|  | Pension |  |  | OPEB |
(in thousands) |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Service cost |  | $ | 1,321 |  |  | $ | 1,355 |  |  | $ | 22 |  |  | $ | 27 |
Interest cost |  |  | 3,124 |  |  |  | 3,139 |  |  |  | 220 |  |  |  | 294 |
Expected return on plan assets |  |  | (3,237 | ) |  |  | (3,028 | ) |  |  | — |  |  |  | — |
Amortization of prior service cost |  |  | 5 |  |  |  | 10 |  |  |  | — |  |  |  | — |
Amortization of actuarial (gain) loss |  |  | 19 |  |  |  | (21 | ) |  |  | (331 | ) |  |  | (166 | )
Total net periodic cost |  | $ | 1,232 |  |  | $ | 1,455 |  |  | $ | (89 | ) |  | $ | 155 |
|  | Nine Months Ended September 30, |
|  | Pension |  |  | OPEB |
(in thousands) |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Service cost |  | $ | 3,964 |  |  | $ | 4,066 |  |  | $ | 69 |  |  | $ | 82 |
Interest cost |  |  | 9,369 |  |  |  | 9,414 |  |  |  | 658 |  |  |  | 881 |
Expected return on plan assets |  |  | (9,711 | ) |  |  | (9,081 | ) |  |  | — |  |  |  | — |
Amortization of prior service cost |  |  | 15 |  |  |  | 32 |  |  |  | — |  |  |  | — |
Amortization of actuarial (gain) loss |  |  | 59 |  |  |  | (63 | ) |  |  | (992 | ) |  |  | (498 | )
Net periodic cost |  | $ | 3,696 |  |  | $ | 4,368 |  |  | $ | (265 | ) |  | $ | 465 |
During the nine months ended September 30, 2024 and 2023, funding of non-qualified pension and other postretirement employee benefit plans was $3.3 million and $2.2 million, respectively. During the nine months ended September 30, 2024 and 2023, we made contributions to our qualified pension benefit plan of $4.0 million and $0, respectively.

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