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Employee Benefit Plans 3 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Amounts recognized on the balance sheets: |  |  |
Non-current liabilities | $ (61,365) | $ (95,639) |
Pension Benefits |  |  |
Amounts recognized on the balance sheets: |  |  |
Non-current assets | 0 | 0 |
Current liabilities | 0 | 0 |
Non-current liabilities | (26,227) | (59,639) |
Net amount recognized | (26,227) | (59,639) |
Amounts recognized in regulatory assets consist of: |  |  |
Prior service cost (credit) | 2,323 | 2,757 |
Net (gain) loss | 23,368 | 57,716 |
Regulatory assets (liabilities) | 25,691 | 60,473 | $ 40,500
Unfunded accrued pension cost | 536 | (834) |
Net liability (asset) recognized | 26,227 | 59,639 |
Changes in plan assets and benefit obligations recognized in regulatory assets: |  |  |
Regulatory asset at beginning of year | 60,473 | 40,500 |
Net loss (gain) | (30,531) | 22,343 |
New prior service cost | 0 | 0 |
Amortization of prior service (cost) credit | (434) | (435) |
Amortization of net gain (loss) | (3,817) | (1,935) |
Total change in regulatory asset | (34,782) | 19,973 |
Regulatory asset (liability) at end of year | 25,691 | 60,473 | 40,500
Net periodic pension costs | 4,859 | 4,010 | $ 4,447
Change in regulatory asset | (34,782) | 19,973 |
Total recognized in net periodic pension cost and regulatory asset (liability) | (29,923) | 23,983 |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation | 259,751 | 272,786 |
Accumulated benefit obligation | 243,412 | 253,108 |
Fair value of plan assets | $ 233,524 | $ 213,147 |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |
Discount rate | 2.89% | 2.55% |
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 | $ 11,087 | $ 6,407 |
Current liabilities | 0 | 0 |
Non-current liabilities | 0 | 0 |
Net amount recognized | 11,087 | 6,407 |
Amounts recognized in regulatory assets consist of: |  |  |
Prior service cost (credit) | 0 | 0 |
Net (gain) loss | (9,839) | (6,855) |
Regulatory assets (liabilities) | (9,839) | (6,855) | $ (5,432)
Unfunded accrued pension cost | (1,248) | 448 |
Net liability (asset) recognized | (11,087) | (6,407) |
Changes in plan assets and benefit obligations recognized in regulatory assets: |  |  |
Regulatory asset at beginning of year | (6,855) | (5,432) |
Net loss (gain) | (4,401) | (2,400) |
New prior service cost | 0 | 0 |
Amortization of prior service (cost) credit | 0 | 0 |
Amortization of net gain (loss) | 1,417 | 977 |
Total change in regulatory asset | (2,984) | (1,423) |
Regulatory asset (liability) at end of year | (9,839) | (6,855) | (5,432)
Net periodic pension costs | (1,695) | (1,108) | $ (779)
Change in regulatory asset | (2,984) | (1,423) |
Total recognized in net periodic pension cost and regulatory asset (liability) | (4,679) | (2,531) |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation | 2,686 | 5,906 |
Fair value of plan assets | $ 13,773 | $ 12,313 |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |
Discount rate | 2.46% | 2.20% |

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