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Employee Benefit Plans 3 (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Amounts recognized on the balance sheets: |  |  |  |  |  |
Non-current liabilities |  |  |  | $ (95,639) | $ (68,469) |
Pension Benefits |  |  |  |  |  |
Amounts recognized on the balance sheets: |  |  |  |  |  |
Non-current assets |  |  |  | 0 | 0 |
Current liabilities |  |  |  | 0 | 0 |
Non-current liabilities |  |  |  | (59,639) | (39,375) |
Net amount recognized |  |  |  | (59,639) | (39,375) |
Amounts recognized in regulatory assets consist of: |  |  |  |  |  |
Prior service cost (credit) |  |  |  | 2,757 | 3,191 |
Net (gain) loss |  |  |  | 57,716 | 37,309 |
Regulatory assets (liabilities) | $ 60,473 | $ 35,213 | $ 35,213 | 60,473 | 40,500 | $ 35,213
Unfunded accrued pension cost |  |  |  | (834) | (1,125) |
Net liability (asset) recognized |  |  |  | 59,639 | 39,375 |
Changes in plan assets and benefit obligations recognized in regulatory assets: |  |  |  |  |  |
Regulatory asset at beginning of year | 40,500 | 35,213 |  |  |  |
Net loss (gain) | (22,343) | (7,140) |  |  |  |
New prior service cost | 0 | 0 |  |  |  |
Amortization of prior service (cost) credit | (435) | (434) |  |  |  |
Amortization of net gain (loss) | (1,935) | (1,419) |  |  |  |
Total change in regulatory asset | 19,973 | 5,287 |  |  |  |
Regulatory asset (liability) at end of year | 60,473 | 40,500 | 35,213 |  |  |
Net periodic pension costs | 4,010 | 4,447 | 3,070 |  |  |
Change in regulatory asset | 19,973 | 5,287 |  |  |  |
Total recognized in net periodic pension cost and regulatory asset (liability) | 23,983 | 9,734 |  |  |  |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |  |  |  |
Projected benefit obligation |  |  |  | 272,786 | 231,852 |
Accumulated benefit obligation |  |  |  | 253,108 | 215,996 |
Fair value of plan assets |  |  |  | $ 213,147 | $ 192,477 |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |  |  |  |
Discount rate |  |  |  | 2.55% | 3.43% |
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 |  |  |  | $ 6,407 | $ 3,876 |
Current liabilities |  |  |  | 0 | 0 |
Non-current liabilities |  |  |  | 0 | 0 |
Net amount recognized |  |  |  | 6,407 | 3,876 |
Amounts recognized in regulatory assets consist of: |  |  |  |  |  |
Prior service cost (credit) |  |  |  | 0 | 0 |
Net (gain) loss |  |  |  | (6,855) | (5,432) |
Regulatory assets (liabilities) | (5,432) | (5,432) | (4,459) | (6,855) | (5,432) | $ (4,459)
Unfunded accrued pension cost |  |  |  | 448 | 1,556 |
Net liability (asset) recognized |  |  |  | (6,407) | (3,876) |
Changes in plan assets and benefit obligations recognized in regulatory assets: |  |  |  |  |  |
Regulatory asset at beginning of year | (5,432) | (4,459) |  |  |  |
Net loss (gain) | 2,400 | 1,775 |  |  |  |
New prior service cost | 0 | 0 |  |  |  |
Amortization of prior service (cost) credit | 0 | 0 |  |  |  |
Amortization of net gain (loss) | 977 | 802 |  |  |  |
Total change in regulatory asset | (1,423) | (973) |  |  |  |
Regulatory asset (liability) at end of year | (6,855) | (5,432) | (4,459) |  |  |
Net periodic pension costs | (1,108) | (779) | $ (752) |  |  |
Change in regulatory asset | (1,423) | (973) |  |  |  |
Total recognized in net periodic pension cost and regulatory asset (liability) | $ (2,531) | $ (1,752) |  |  |  |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |  |  |  |
Projected benefit obligation |  |  |  | 5,906 | 7,395 |
Fair value of plan assets |  |  |  | $ 12,313 | $ 11,271 |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |  |  |  |
Discount rate |  |  |  | 2.20% | 3.12% |

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