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Pension and Other Postretirement Employee Benefits | 3 Months Ended
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Mar. 31, 2025
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 March 31, |
|  | Pension |  |  | OPEB |
(in thousands) |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Service cost |  | $ | 1,266 |  |  | $ | 1,321 |  |  | $ | 14 |  |  | $ | 23 |
Interest cost |  |  | 3,228 |  |  |  | 3,123 |  |  |  | 252 |  |  |  | 219 |
Expected return on plan assets |  |  | (2,932 | ) |  |  | (3,237 | ) |  |  | — |  |  |  | — |
Amortization of prior service cost |  |  | — |  |  |  | 5 |  |  |  | — |  |  |  | — |
Amortization of actuarial (gain) loss |  |  | 43 |  |  |  | 20 |  |  |  | (240 | ) |  |  | (331 | )
Total net periodic cost |  | $ | 1,605 |  |  | $ | 1,232 |  |  | $ | 26 |  |  | $ | (89 | )
Funding of our non-qualified pension and other postretirement employee benefit plans was $0.9 million for both the three months ended March 31, 2025 and 2024. During the three months ended March 31, 2025 and 2024, we made contributions to our qualified pension benefit plan of $0.7 million and $0, respectively.

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