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Pension and Other Postretirement Employee Benefits (Tables) | 9 Months Ended
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Sep. 30, 2024
Retirement Benefits, Description [Abstract] |
Components of Net Periodic Cost (Benefit) | 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 September 30, |
|  | Pension |  |  | OPEB |
(in thousands) |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Service cost |  | $ | 1,321 |  |  | $ | 1,355 |  |  | $ | 22 |  |  | $ | 27 |
Interest cost |  |  | 3,124 |  |  |  | 3,139 |  |  |  | 220 |  |  |  | 294 |
Expected return on plan assets |  |  | (3,237 | ) |  |  | (3,028 | ) |  |  | — |  |  |  | — |
Amortization of prior service cost |  |  | 5 |  |  |  | 10 |  |  |  | — |  |  |  | — |
Amortization of actuarial (gain) loss |  |  | 19 |  |  |  | (21 | ) |  |  | (331 | ) |  |  | (166 | )
Total net periodic cost |  | $ | 1,232 |  |  | $ | 1,455 |  |  | $ | (89 | ) |  | $ | 155 |
|  | Nine Months Ended September 30, |
|  | Pension |  |  | OPEB |
(in thousands) |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Service cost |  | $ | 3,964 |  |  | $ | 4,066 |  |  | $ | 69 |  |  | $ | 82 |
Interest cost |  |  | 9,369 |  |  |  | 9,414 |  |  |  | 658 |  |  |  | 881 |
Expected return on plan assets |  |  | (9,711 | ) |  |  | (9,081 | ) |  |  | — |  |  |  | — |
Amortization of prior service cost |  |  | 15 |  |  |  | 32 |  |  |  | — |  |  |  | — |
Amortization of actuarial (gain) loss |  |  | 59 |  |  |  | (63 | ) |  |  | (992 | ) |  |  | (498 | )
Net periodic cost |  | $ | 3,696 |  |  | $ | 4,368 |  |  | $ | (265 | ) |  | $ | 465 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-4 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-2 + Details
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