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Employee Benefit Plans: Amounts Recognized in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Regulatory assets | $ 652,981 | $ 796,599
Benefit plan liabilities | 116,742 | 123,925
Regulatory liabilities | 518,573 | 502,951
Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Regulatory assets | 78,654 | 67,403
Current liabilities | 0 | 0
Non-current assets | 0 | 0
Benefit plan liabilities | 35,243 | 19,872
Regulatory liabilities | 2,804 | 3,830
Supplemental Employee Retirement Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Regulatory assets | 0 | 0
Current liabilities | 2,231 | 2,156
Non-current assets | 0 | 0
Benefit plan liabilities | 42,994 | 53,104
Regulatory liabilities |  |
Other Postretirement Benefits Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Regulatory assets | 3,788 | 11,660
Current liabilities | 4,427 | 4,584
Non-current assets | 959 | 0
Benefit plan liabilities | 38,505 | 50,949
Regulatory liabilities | $ 6,198 | $ 2,447

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