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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Amounts recognized on the balance sheets: |  |  |
Non-current liabilities | $ (32,652) | $ (33,636) |
Pension Benefits |  |  |
Amounts recognized on the balance sheets: |  |  |
Non-current assets | 2,342 | 0 |
Current liabilities | 0 | 0 |
Non-current liabilities | 0 | (3,772) |
Net amount recognized | 2,342 | (3,772) |
Amounts recognized in regulatory assets (liabilities) consist of: |  |  |
Prior service cost (credit) | 1,454 | 1,889 |
Net loss (gain) | (1,899) | 4,123 |
Regulatory assets (liabilities) | (445) | 6,012 | $ 25,691
Prefunded plan costs | (1,897) | (2,240) |
Net liability (asset) recognized | (2,342) | 3,772 |
Changes in plan assets and benefit obligations recognized in regulatory assets (liabilities): |  |  |
Regulatory asset (liability) at beginning of year | 6,012 | 25,691 |
Net loss (gain) | (6,023) | (19,245) |
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) | (6,457) | (19,679) |
Regulatory asset (liability) at end of year | (445) | 6,012 | 25,691
Net periodic pension costs | 3,289 | 313 | $ 4,859
Change in regulatory asset (liability) | (6,457) | (19,679) |
Total recognized in net periodic pension cost and regulatory asset (liability) | (3,168) | (19,366) |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation | 202,963 | 190,678 |
Accumulated benefit obligation | 192,986 | 181,376 |
Fair value of plan assets | $ 205,305 | $ 186,906 |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |
Discount rate | 5.16% | 5.41% |
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 | 7.00% | 7.00% | 7.00%
Post-Retirement Medical Benefits |  |  |
Amounts recognized on the balance sheets: |  |  |
Non-current assets | $ 10,862 | $ 9,226 |
Current liabilities | 0 | 0 |
Non-current liabilities | 0 | 0 |
Net amount recognized | 10,862 | 9,226 |
Amounts recognized in regulatory assets (liabilities) consist of: |  |  |
Prior service cost (credit) | 0 | 0 |
Net loss (gain) | (6,272) | (5,846) |
Regulatory assets (liabilities) | (6,272) | (5,846) | $ (9,839)
Prefunded plan costs | (4,590) | (3,380) |
Net liability (asset) recognized | (10,862) | (9,226) |
Changes in plan assets and benefit obligations recognized in regulatory assets (liabilities): |  |  |
Regulatory asset (liability) at beginning of year | (5,846) | (9,839) |
Net loss (gain) | (1,395) | 2,259 |
New prior service cost | 0 | 0 |
Amortization of prior service (cost) credit | 0 | 0 |
Amortization of net gain (loss) | 969 | 1,734 |
Total change in regulatory asset (liability) | (426) | 3,993 |
Regulatory asset (liability) at end of year | (6,272) | (5,846) | (9,839)
Net periodic pension costs | (1,210) | (2,132) | $ (1,695)
Change in regulatory asset (liability) | (426) | 3,993 |
Total recognized in net periodic pension cost and regulatory asset (liability) | (1,636) | 1,861 |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation | 1,965 | 2,014 |
Fair value of plan assets | $ 12,827 | $ 11,240 |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |
Discount rate | 5.04% | 5.34% |

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