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Pension and Other Postretirement Employee Benefits | 6 Months Ended
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Jun. 30, 2024
Retirement Benefits, Description [Abstract] |
Pension and Other Postretirement Employee Benefits | NOTE 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 June 30, |
|  | Pension |  |  | OPEB |
(in thousands) |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Service cost |  | $ | 1,322 |  |  | $ | 1,355 |  |  | $ | 24 |  |  | $ | 28 |
Interest cost |  |  | 3,122 |  |  |  | 3,137 |  |  |  | 219 |  |  |  | 293 |
Expected return on plan assets |  |  | (3,237 | ) |  |  | (3,025 | ) |  |  | — |  |  |  | — |
Amortization of prior service cost |  |  | 5 |  |  |  | 11 |  |  |  | — |  |  |  | — |
Amortization of actuarial (gain) loss |  |  | 20 |  |  |  | (21 | ) |  |  | (330 | ) |  |  | (166 | )
Total net periodic cost |  | $ | 1,232 |  |  | $ | 1,457 |  |  | $ | (87 | ) |  | $ | 155 |
|  | Six Months Ended June 30, |
|  | Pension |  |  | OPEB |
(in thousands) |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Service cost |  | $ | 2,643 |  |  | $ | 2,711 |  |  | $ | 47 |  |  | $ | 55 |
Interest cost |  |  | 6,245 |  |  |  | 6,275 |  |  |  | 438 |  |  |  | 587 |
Expected return on plan assets |  |  | (6,474 | ) |  |  | (6,053 | ) |  |  | — |  |  |  | — |
Amortization of prior service cost |  |  | 10 |  |  |  | 22 |  |  |  | — |  |  |  | — |
Amortization of actuarial (gain) loss |  |  | 40 |  |  |  | (42 | ) |  |  | (661 | ) |  |  | (332 | )
Net periodic cost |  | $ | 2,464 |  |  | $ | 2,913 |  |  | $ | (176 | ) |  | $ | 310 |
During the six months ended June 30, 2024 and 2023, funding of pension and other postretirement employee benefit plans was $2.1 million and $2.3 million, respectively.

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