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Employee Postretirement Benefits | 9 Months Ended
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Sep. 30, 2024
Retirement Benefits [Abstract] |
Employee Postretirement Benefits | Employee Postretirement Benefits Pension Plan and Other Postretirement Benefits The Company sponsors a noncontributory funded pension plan (the "Pension Plan"), an unfunded, nonqualified Executive Survivor and Supplemental Retirement Plan (the "ESSRP"), both accounted for as defined benefit pension plans, and a postretirement healthcare plan accounted for as an other postretirement benefit plan. The following tables include the components of net periodic benefit cost (income) related to our defined benefit pension plans and other postretirement benefits for the three and nine months ended September 30, 2024 and 2023:
| Three Months Ended September 30,
| Pension Benefits (Pension Plan) |  | Pension Benefits (ESSRP) |  | Postretirement Benefits
(in thousands) | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Service Cost | $ | 972 |  |  | $ | 925 |  |  | $ | — |  |  | $ | 18 |  |  | $ | 123 |  |  | $ | 152 |
Interest Cost | 4,297 |  |  | 4,109 |  |  | 474 |  |  | 472 |  |  | 399 |  |  | 668 |
Expected Return on Assets | (6,380) |  |  | (6,479) |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of Prior Service Cost | — |  |  | — |  |  | — |  |  | — |  |  | (1,576) |  |  | (1,433) |
Amortization of Net Actuarial Loss | 40 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net Periodic Benefit Cost (Income) | $ | (1,071) |  |  | $ | (1,445) |  |  | $ | 474 |  |  | $ | 490 |  |  | $ | (1,054) |  |  | $ | (613) |
| Nine Months Ended September 30,
| Pension Benefits (Pension Plan) |  | Pension Benefits (ESSRP) |  | Postretirement Benefits
(in thousands) | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Service Cost | $ | 2,915 |  |  | $ | 2,774 |  |  | $ | — |  |  | $ | 54 |  |  | $ | 368 |  |  | $ | 458 |
Interest Cost | 12,891 |  |  | 12,327 |  |  | 1,422 |  |  | 1,417 |  |  | 1,199 |  |  | 2,006 |
Expected Return on Assets | (19,139) |  |  | (19,436) |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of Prior Service Cost | — |  |  | — |  |  | — |  |  | — |  |  | (4,727) |  |  | (4,300) |
Amortization of Net Actuarial Loss | 119 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net Periodic Benefit Cost (Income) | $ | (3,214) |  |  | $ | (4,335) |  |  | $ | 1,422 |  |  | $ | 1,471 |  |  | $ | (3,160) |  |  | $ | (1,836) |
The following table includes the impact of regulation on the recognition of periodic benefit cost (income) arising from pension and other postretirement benefits for the three and nine months ended September 30, 2024 and 2023:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2024 |  | 2023 |  | 2024 |  | 2023
Net Periodic Benefit Cost (Income) | $ | (1,651) |  |  | $ | (1,568) |  |  | $ | (4,952) |  |  | $ | (4,700) |
Net Amount Amortized Due to the Effect of Regulation | 379 |  |  | 374 |  |  | 1,038 |  |  | 864 |
Net Periodic Benefit Cost (Income) Recognized | $ | (1,272) |  |  | $ | (1,194) |  |  | $ | (3,914) |  |  | $ | (3,836) |
We had no minimum funding requirements for our Pension Plan or any other postretirement benefit plans as of December 31, 2023. We did not make any contributions to our Pension Plan during the nine months ended September 30, 2024 and 2023.

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