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Postretirement Benefits - Funding Policy/Funded Status (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Postretirement benefits |  |
Employer contributions during fiscal year | $ 37,061 | $ 96,222
Net amount recognized in the Statements of Financial Position: |  |
Funded status at end of year | (11,718) | 3,325
Pension asset | 21,311 | 34,320
Pension liabilities – due within one year | (4,959) | (4,735)
Pension liabilities – due after one year | (28,070) | (26,260)
Net amount recognized | $ (11,718) | 3,325
Employee Pension Plan |  |
Postretirement benefits |  |
Funding target (as a percentage of the funding target liability) | 100.00% |
Employer contributions during fiscal year | $ 33,000 | $ 95,000
Employer contributions, 2024 | $ 39,000 |

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