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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Amounts recognized on the balance sheets: |  |  |
Non-current liabilities | $ (33,636) | $ (61,365) |
Pension Benefits |  |  |
Amounts recognized on the balance sheets: |  |  |
Non-current assets | 0 | 0 |
Current liabilities | 0 | 0 |
Non-current liabilities | (3,772) | (26,227) |
Net amount recognized | (3,772) | (26,227) |
Amounts recognized in regulatory assets consist of: |  |  |
Prior service cost (credit) | 1,889 | 2,323 |
Net (gain) loss | 4,123 | 23,368 |
Regulatory assets (liabilities) | 6,012 | 25,691 | $ 60,473
Unfunded accrued pension cost | (2,240) | 536 |
Net liability (asset) recognized | 3,772 | 26,227 |
Changes in plan assets and benefit obligations recognized in regulatory assets (liabilities): |  |  |
Regulatory asset (liability) at beginning of year | 25,691 | 60,473 |
Net loss (gain) | (19,245) | (30,531) |
New prior service cost | 0 | 0 |
Amortization of prior service (cost) credit | (434) | (434) |
Amortization of net gain (loss) | 0 | (3,817) |
Total change in regulatory asset (liability) | (19,679) | (34,782) |
Regulatory asset (liability) at end of year | 6,012 | 25,691 | 60,473
Net periodic pension costs | 313 | 4,859 | $ 4,010
Change in regulatory asset (liability) | (19,679) | (34,782) |
Total recognized in net periodic pension cost and regulatory asset (liability) | (19,366) | (29,923) |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation | 190,678 | 259,751 |
Accumulated benefit obligation | 181,376 | 243,412 |
Fair value of plan assets | $ 186,906 | $ 233,524 |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |
Discount rate | 5.41% | 2.89% |
Pension Benefits | Minimum |  |  |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |
Rate of compensation increase | 3.00% | 3.00% | 3.00%
Pension Benefits | Maximum |  |  |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |
Rate of compensation increase | 8.00% | 8.00% | 8.00%
Post-Retirement Medical Benefits |  |  |
Amounts recognized on the balance sheets: |  |  |
Non-current assets | $ 9,226 | $ 11,087 |
Current liabilities | 0 | 0 |
Non-current liabilities | 0 | 0 |
Net amount recognized | 9,226 | 11,087 |
Amounts recognized in regulatory assets consist of: |  |  |
Prior service cost (credit) | 0 | 0 |
Net (gain) loss | (5,846) | (9,839) |
Regulatory assets (liabilities) | (5,846) | (9,839) | $ (6,855)
Unfunded accrued pension cost | (3,380) | (1,248) |
Net liability (asset) recognized | (9,226) | (11,087) |
Changes in plan assets and benefit obligations recognized in regulatory assets (liabilities): |  |  |
Regulatory asset (liability) at beginning of year | (9,839) | (6,855) |
Net loss (gain) | 2,259 | (4,401) |
New prior service cost | 0 | 0 |
Amortization of prior service (cost) credit | 0 | 0 |
Amortization of net gain (loss) | 1,734 | 1,417 |
Total change in regulatory asset (liability) | 3,993 | (2,984) |
Regulatory asset (liability) at end of year | (5,846) | (9,839) | (6,855)
Net periodic pension costs | (2,132) | (1,695) | $ (1,108)
Change in regulatory asset (liability) | 3,993 | (2,984) |
Total recognized in net periodic pension cost and regulatory asset (liability) | 1,861 | (4,679) |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation | 2,014 | 2,686 |
Fair value of plan assets | $ 11,240 | $ 13,773 |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |
Discount rate | 5.34% | 2.46% |

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