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Pension and Other Postretirement Employee Benefits | 3 Months Ended
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Mar. 31, 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 benefits (OPEB):
|  | Three Months Ended March 31, |
|  | Pension |  |  | OPEB |
(in thousands) |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Service cost |  | $ | 1,321 |  |  | $ | 1,356 |  |  | $ | 23 |  |  | $ | 27 |
Interest cost |  |  | 3,123 |  |  |  | 3,138 |  |  |  | 219 |  |  |  | 294 |
Expected return on plan assets |  |  | (3,237 | ) |  |  | (3,028 | ) |  |  | — |  |  |  | — |
Amortization of prior service cost |  |  | 5 |  |  |  | 11 |  |  |  | — |  |  |  | — |
Amortization of actuarial (gain) loss |  |  | 20 |  |  |  | (21 | ) |  |  | (331 | ) |  |  | (166 | )
Total net periodic cost |  | $ | 1,232 |  |  | $ | 1,456 |  |  | $ | (89 | ) |  | $ | 155 |
During the three months ended March 31, 2024 and 2023, funding of pension and other postretirement employee benefit plans was $0.9 million and $1.1 milli on, respectively.

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