Pension and Other Postretirement Benefits (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Pension Benefits | ||||
| Components of net periodic benefit cost (credit) | ||||
| Service cost | $ 1,017 | $ 1,278 | $ 2,062 | $ 2,557 |
| Interest cost | 2,616 | 2,923 | 5,215 | 5,815 |
| Expected return on plan assets | (1,859) | (2,125) | (3,617) | (4,142) |
| Settlements | 203 | 0 | 885 | 0 |
| Amortization of net loss (gain) | 99 | 74 | 199 | 141 |
| Amortization of prior service cost (credit) | 18 | 22 | 36 | 44 |
| Net periodic benefit cost (credit) | 2,094 | 2,172 | 4,780 | 4,415 |
| Postretirement Benefits | ||||
| Components of net periodic benefit cost (credit) | ||||
| Service cost | 66 | 71 | 155 | 161 |
| Interest cost | 148 | 132 | 277 | 275 |
| Expected return on plan assets | 0 | 0 | 0 | 0 |
| Settlements | 0 | 0 | 0 | 0 |
| Amortization of net loss (gain) | (128) | (280) | (328) | (517) |
| Amortization of prior service cost (credit) | 0 | (1) | 0 | (2) |
| Net periodic benefit cost (credit) | $ 86 | $ (78) | $ 104 | $ (83) |
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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