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Employee Benefit Plans - Pension Benefits and Post-Retirement Medical Benefits Recognized on Balance Sheet (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Amounts recognized on the balance sheets: |  |  |
Non-current liabilities | $ (33,816) | $ (32,652) |
Pension Benefits |  |  |
Amounts recognized on the balance sheets: |  |  |
Non-current assets | 21,677 | 2,342 |
Current liabilities | 0 | 0 |
Non-current liabilities | 0 | 0 |
Net amount recognized | 21,677 | 2,342 |
Amounts recognized in regulatory assets (liabilities) consist of: |  |  |
Prior service cost (credit) | 1,020 | 1,454 |
Net loss (gain) | (19,867) | (1,899) |
Regulatory assets (liabilities) | (18,847) | (445) | $ 6,012
Prefunded plan costs | (2,830) | (1,897) |
Net liability (asset) recognized | (21,677) | (2,342) |
Changes in plan assets and benefit obligations recognized in regulatory assets (liabilities): |  |  |
Regulatory asset (liability) at beginning of year | (445) | 6,012 |
Net loss (gain) | (17,968) | (6,023) |
New prior service cost | 0 | 0 |
Amortization of prior service (cost) credit | (434) | (434) |
Amortization of net gain (loss) | 0 | 0 |
Total change in regulatory asset (liability) | (18,402) | (6,457) |
Regulatory asset (liability) at end of year | (18,847) | (445) | 6,012
Net periodic pension costs | 1,968 | 3,289 | $ 313
Change in regulatory asset (liability) | (18,402) | (6,457) |
Total recognized in net periodic pension cost and regulatory asset (liability) | (16,434) | (3,168) |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation | 195,485 | 202,963 |
Accumulated benefit obligation | 186,679 | 192,986 |
Fair value of plan assets | $ 217,162 | $ 205,305 |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |
Discount rate | 5.70% | 5.16% |
Pension Benefits | Minimum |  |  |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |
Rate of compensation increase | 2.50% | 2.50% | 2.50%
Pension Benefits | Maximum |  |  |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |
Rate of compensation increase | 6.00% | 6.00% | 6.00%
Post-Retirement Medical Benefits |  |  |
Amounts recognized on the balance sheets: |  |  |
Non-current assets | $ 12,574 | $ 10,862 |
Current liabilities | 0 | 0 |
Non-current liabilities | 0 | 0 |
Net amount recognized | 12,574 | 10,862 |
Amounts recognized in regulatory assets (liabilities) consist of: |  |  |
Prior service cost (credit) | 0 | 0 |
Net loss (gain) | (6,531) | (6,272) |
Regulatory assets (liabilities) | (6,531) | (6,272) | $ (5,846)
Prefunded plan costs | (6,043) | (4,590) |
Net liability (asset) recognized | (12,574) | (10,862) |
Changes in plan assets and benefit obligations recognized in regulatory assets (liabilities): |  |  |
Regulatory asset (liability) at beginning of year | (6,272) | (5,846) |
Net loss (gain) | (1,371) | (1,395) |
New prior service cost | 0 | 0 |
Amortization of prior service (cost) credit | 0 | 0 |
Amortization of net gain (loss) | 1,112 | 969 |
Total change in regulatory asset (liability) | (259) | (426) |
Regulatory asset (liability) at end of year | (6,531) | (6,272) | (5,846)
Net periodic pension costs | (1,453) | (1,210) | $ (2,132)
Change in regulatory asset (liability) | (259) | (426) |
Total recognized in net periodic pension cost and regulatory asset (liability) | (1,712) | (1,636) |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation | 1,882 | 1,965 |
Fair value of plan assets | $ 14,456 | $ 12,827 |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |
Discount rate | 5.40% | 5.04% |

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