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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2022
Retirement Benefits [Abstract] |
Schedule of pension plan and other benefits plan |
|  | (Thousands of Dollars)
|  | Pension Plan |  | Other Benefits Plan
|  | December 31,
|  | 2022 |  | 2021 |  | 2022 |  | 2021
Change in Projected Benefit Obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | $ | 113,710 |  |  | $ | 115,861 |  |  | $ | 49,396 |  |  | $ | 52,776 |
Service Cost |  |  | 2,362 |  |  |  | 2,696 |  |  |  | 799 |  |  |  | 917 |
Interest Cost |  |  | 3,042 |  |  |  | 2,706 |  |  |  | 1,325 |  |  |  | 1,236 |
Actuarial (Gain) Loss |  |  | (27,850 | ) |  |  | (4,185 | ) |  |  | (17,761 | ) |  |  | (4,705 | )
Benefits Paid |  |  | (3,476 | ) |  |  | (3,368 | ) |  |  | (850 | ) |  |  | (828 | )
Ending Balance |  | $ | 87,788 |  |  | $ | 113,710 |  |  | $ | 32,909 |  |  | $ | 49,396 |
Schedule of change in fair value of plan assets |
|  | (Thousands of Dollars)
|  | Pension Plan |  | Other Benefits Plan
|  | December 31,
|  | 2022 |  | 2021 |  | 2022 |  | 2021
Change in Fair Value of Plan Assets: |  |  |  |  |  |  |  |
Beginning Balance |  | $ | 100,750 |  |  | $ | 88,921 |  |  | $ | 50,668 |  |  | $ | 44,892 |
Actual Return on Plan Assets |  |  | (14,346 | ) |  |  | 11,798 |  |  |  | (6,639 | ) |  |  | 5,776 |
Employer Contributions |  |  | 1,900 |  |  |  | 3,400 |  |  |  | 850 |  |  |  | 828 |
Benefits Paid |  |  | (3,476 | ) |  |  | (3,369 | ) |  |  | (850 | ) |  |  | (828 | )
Ending Balance |  | $ | 84,828 |  |  | $ | 100,750 |  |  | $ | 44,029 |  |  | $ | 50,668 |
Funded Status |  | $ | (2,960 | ) |  | $ | (12,960 | ) |  | $ | 11,120 |  |  | $ | 1,272 |
Schedule of employee benefit plans recognized in balance sheet |
|  | (Thousands of Dollars)
|  | Pension Plan |  | Other Benefits Plan
|  | December 31,
|  | 2022 |  | 2021 |  | 2022 |  | 2021
Amounts Recognized in the Consolidated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance Sheets consist of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current Liability |  | $ | 529 |  |  | $ | 398 |  |  | $ | — |  |  | $ | — |
Noncurrent Liability (Asset) |  |  | 2,431 |  |  |  | 12,562 |  |  |  | (11,120 | ) |  |  | (1,272 | )
Net Liability (Asset) Recognized |  | $ | 2,960 |  |  | $ | 12,960 |  |  | $ | (11,120 | ) |  | $ | (1,272 | )
Schedule of components of net benefit cost |
|  | (Thousands of Dollars)
|  | Pension Plan |  | Other Benefits Plan
|  | Years Ended December 31,
|  | 2022 |  | 2021 |  | 2020 |  | 2022 |  | 2021 |  | 2020
Components of Net Periodic Benefit Cost |  |  |  |  |  |  |  |  |  |  |  |
Service Cost |  | $ | 2,363 |  |  | $ | 2,696 |  |  | $ | 2,434 |  |  | $ | 799 |  |  | $ | 917 |  |  | $ | 993 |
Interest Cost |  |  | 3,042 |  |  |  | 2,706 |  |  |  | 3,099 |  |  |  | 1,325 |  |  |  | 1,236 |  |  |  | 1,699 |
Expected Return on Plan Assets |  |  | (7,041 | ) |  |  | (6,225 | ) |  |  | (5,635 | ) |  |  | (3,547 | ) |  |  | (3,142 | ) |  |  | (2,853 | )
Amortization of Net Actuarial Loss |  |  | 1,673 |  |  |  | 2,868 |  |  |  | 2,059 |  |  |  | — |  |  |  | 527 |  |  |  | 1,352 |
Net Periodic Benefit Cost* |  | $ | 37 |  |  | $ | 2,045 |  |  | $ | 1,957 |  |  | $ | (1,423 | ) |  | $ | (462 | ) |  | $ | 1,191 |
*Service cost is included in Operations and Maintenance expense on the consolidated statements of income; all other amounts are included in Other Income (Expense), net.
Schedule of regulatory assets into net periodic benefit cost |
|  | (Thousands of Dollars)
|  | Pension Plan |  | Other Benefits Plan
Actuarial Loss (Gain) |  | $ | 658 |  |  | $ | (191 | )
Schedule of discount and compensation rates |
|  | Pension Plan |  | Other Benefits Plan
|  | 2022 |  | 2021 |  | 2020 |  | 2022 |  | 2021 |  | 2020
Weighted Average Assumptions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected Return on Plan Assets |  |  | 7.00 | % |  |  | 7.00 | % |  |  | 7.00 | % |  |  | 7.00 | % |  |  | 7.00 | % |  |  | 7.00 | %
Discount Rate for: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit Obligation |  |  | 4.98 | % |  |  | 2.72 | % |  |  | 2.37 | % |  |  | 4.98 | % |  |  | 2.72 | % |  |  | 2.37 | %
Benefit Cost |  |  | 2.72 | % |  |  | 2.37 | % |  |  | 3.12 | % |  |  | 2.72 | % |  |  | 2.37 | % |  |  | 3.12 | %
Compensation Increase for: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit Obligation |  |  | 3.00 | % |  |  | 3.00 | % |  |  | 3.00 | % |  |  | 3.00 | % |  |  | 3.00 | % |  |  | 3.00 | %
Benefit Cost |  |  | 3.00 | % |  |  | 3.00 | % |  |  | 3.00 | % |  |  | 3.00 | % |  |  | 3.00 | % |  |  | 3.00 | %
Schedule of effect of one-percentage point change in assumed health care cost trend rates |
|  | (Thousands of Dollars)
|  | 1 Percentage Point
|  | Increase |  | Decrease
Effect on Current Year Service and Interest Costs |  | $ | 435 |  |  | $ | (334 | )
Effect on Projected Benefit Obligation |  | $ | 4,239 |  |  | $ | (3,448 | )
Schedule of expected benefit payments |
|  | (Thousands of Dollars)
Year |  | Pension Plan |  | Other Benefits Plan
2023 |  | $ | 4,153 |  |  | $ | 1,262 |
2024 |  |  | 4,961 |  |  |  | 1,423 |
2025 |  |  | 5,349 |  |  |  | 1,550 |
2026 |  |  | 5,344 |  |  |  | 1,645 |
2027 |  |  | 5,437 |  |  |  | 1,699 |
2028-2032 |  |  | 28,483 |  |  |  | 9,363 |
Totals |  | $ | 53,727 |  |  | $ | 16,942 |
Schedule of allocation of plan assets |
|  | Pension Plan |  | Other Benefits Plan
Asset Category |  | 2022 |  | 2021 |  | Target |  | 2022 |  | 2021 |  | Target
Equity Securities |  |  | 53.6 | % |  |  | 59.6 | % |  |  | 55 | % |  |  | 55.2 | % |  |  | 66.8 | % |  |  | 43 | %
Debt Securities |  |  | 40.9 | % |  |  | 37.9 | % |  |  | 38 | % |  |  | 24.7 | % |  |  | 30.7 | % |  |  | 50 | %
Cash |  |  | 3.9 | % |  |  | 1.0 | % |  |  | 2 | % |  |  | 20.1 | % |  |  | 2.5 | % |  |  | 2 | %
Real Estate/Commodities |  |  | 1.6 | % |  |  | 1.5 | % |  |  | 5 | % |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 5 | %
Total |  |  | 100.0 | % |  |  | 100.0 | % |  |  |  |  |  |  | 100.0 | % |  |  | 100.0 | % |  |  |  |
Schedule of fair value of plan assets |
|  | (Thousands of Dollars)
|  | As of December 31, 2022
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Mutual Funds |  | $ | 71,559 |  |  | $ | — |  |  | $ | — |  |  | $ | 71,559 |
Money Market Funds |  |  | 3,271 |  |  |  | — |  |  |  | — |  |  |  | 3,271 |
Common Equity Securities |  |  | 9,998 |  |  |  | — |  |  |  | — |  |  |  | 9,998 |
Total Investments |  | $ | 84,828 |  |  | $ | — |  |  | $ | — |  |  | $ | 84,828 |
|  | (Thousands of Dollars)
|  | As of December 31, 2021
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Mutual Funds |  | $ | 87,687 |  |  | $ | — |  |  | $ | — |  |  | $ | 87,687 |
Money Market Funds |  |  | 1,057 |  |  |  | — |  |  |  | — |  |  |  | 1,057 |
Common Equity Securities |  |  | 12,006 |  |  |  | — |  |  |  | — |  |  |  | 12,006 |
Total Investments |  | $ | 100,750 |  |  | $ | — |  |  | $ | — |  |  | $ | 100,750 |
|  | (Thousands of Dollars)
|  | As of December 31, 2022
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Mutual Funds |  | $ | 23,660 |  |  | $ | — |  |  | $ | — |  |  | $ | 23,660 |
Money Market Funds |  |  | 8,623 |  |  |  | — |  |  |  | — |  |  |  | 8,623 |
Agency/US/State/Municipal Debt |  |  | — |  |  |  | 10,592 |  |  |  | — |  |  |  | 10,592 |
Other |  |  | 1,154 |  |  |  | — |  |  |  | — |  |  |  | 1,154 |
Total Investments |  | $ | 33,437 |  |  | $ | 10,592 |  |  | $ | — |  |  | $ | 44,029 |
|  | (Thousands of Dollars)
|  | As of December 31, 2021
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Mutual Funds |  | $ | 33,844 |  |  | $ | — |  |  | $ | — |  |  | $ | 33,844 |
Money Market Funds |  |  | 1,291 |  |  |  | — |  |  |  | — |  |  |  | 1,291 |
Agency/US/State/Municipal Debt |  |  | — |  |  |  | 15,533 |  |  |  | — |  |  |  | 15,533 |
Total Investments |  | $ | 35,135 |  |  | $ | 15,533 |  |  | $ | — |  |  | $ | 50,668 |
Schedule of table presents awarded but not yet vested share |
|  | Shares(thousands) |  |  | Unearned Compensation (thousands) |  |  | Weighted Average Granted Price |
Balance, January 1, 2020 |  |  | 97 |  |  |  | 1,706 |  |  |  |  |
Granted |  |  | 16 |  |  |  | 982 |  |  | $ | 60.12 |
Vested |  |  | (27 | ) |  |  | — |  |  |  |  |
Amortization of Compensation expense |  |  | — |  |  |  | (851 | ) |  |  |  |
Balance, December 31, 2020 |  |  | 86 |  |  |  | 1,837 |  |  |  |  |
Granted |  |  | 15 |  |  |  | 1,151 |  |  | $ | 79.02 |
Vested |  |  | (18 | ) |  |  |  |  |  |  |  |
Amortization of Compensation expense |  |  | — |  |  |  | (1,057 | ) |  |  |  |
Balance, December 31, 2021 |  |  | 83 |  |  |  | 1,931 |  |  |  |  |
Granted |  |  | 11 |  |  |  | 1,151 |  |  | $ | 105.17 |
Vested |  |  | (17 | ) |  |  | — |  |  |  |  |
Amortization of Compensation expense |  |  | — |  |  |  | (1,350 | ) |  |  |  |
Balance, December 31, 2022 |  |  | 77 |  |  | $ | 1,732 |  |  |  |  |

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