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Employee Postretirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Schedule of Net Periodic Benefit Cost (Income) | 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, 2025 and 2024:
| Three Months Ended September 30,
| Pension Benefits (Pension Plan) |  | Pension Benefits (ESSRP) |  | Postretirement Benefits
(in thousands) | 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024
Service Cost | $ | 876 |  |  | $ | 972 |  |  | $ | — |  |  | $ | — |  |  | $ | 123 |  |  | $ | 123 |
Interest Cost | 4,325 |  |  | 4,297 |  |  | 474 |  |  | 474 |  |  | 403 |  |  | 399 |
Expected Return on Assets | (6,191) |  |  | (6,380) |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of Prior Service Cost | — |  |  | — |  |  | — |  |  | — |  |  | (948) |  |  | (1,576) |
Amortization of Net Actuarial Loss | 335 |  |  | 40 |  |  | — |  |  | — |  |  | — |  |  | — |
Net Periodic Benefit Cost (Income) | $ | (655) |  |  | $ | (1,071) |  |  | $ | 474 |  |  | $ | 474 |  |  | $ | (422) |  |  | $ | (1,054) |
| Nine Months Ended September 30,
| Pension Benefits (Pension Plan) |  | Pension Benefits (ESSRP) |  | Postretirement Benefits
(in thousands) | 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024
Service Cost | $ | 2,627 |  |  | $ | 2,915 |  |  | $ | — |  |  | $ | — |  |  | $ | 368 |  |  | $ | 368 |
Interest Cost | 12,977 |  |  | 12,891 |  |  | 1,421 |  |  | 1,422 |  |  | 1,208 |  |  | 1,199 |
Expected Return on Assets | (18,573) |  |  | (19,139) |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of Prior Service Cost | — |  |  | — |  |  | — |  |  | — |  |  | (2,846) |  |  | (4,727) |
Amortization of Net Actuarial Loss | 1,006 |  |  | 119 |  |  | — |  |  | — |  |  | — |  |  | — |
Net Periodic Benefit Cost (Income) | $ | (1,963) |  |  | $ | (3,214) |  |  | $ | 1,421 |  |  | $ | 1,422 |  |  | $ | (1,270) |  |  | $ | (3,160) |
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, 2025 and 2024:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2025 |  | 2024 |  | 2025 |  | 2024
Net Periodic Benefit Cost (Income) | $ | (603) |  |  | $ | (1,651) |  |  | $ | (1,812) |  |  | $ | (4,952) |
Net Amount Amortized Due to the Effect of Regulation | 1,298 |  |  | 379 |  |  | 2,366 |  |  | 1,038 |
Net Periodic Benefit Cost (Income) Recognized | $ | 695 |  |  | $ | (1,272) |  |  | $ | 554 |  |  | $ | (3,914) |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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