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Other Comprehensive Income: Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Interest expense | $ 162,584 | $ 154,112 | $ 144,931
Fuel, purchased power and cost of natural gas sold | 1,230,550 | 741,934 | 492,404
Operations and maintenance | 548,430 | 501,690 | 495,404
Income Tax Expense (Benefit) | (25,205) | (7,169) | (32,918)
Net income | 270,758 | 251,260 | $ 242,763
Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Net income | (544) | (2,280) |
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Income before income taxes | (142) | (800) |
Income Tax Expense (Benefit) | 58 | 175 |
Net income | (84) | (625) |
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Swap |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Interest expense | (2,850) | (2,851) |
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Commodity Contract |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Fuel, purchased power and cost of natural gas sold | 2,708 | 2,051 |
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Operations and maintenance | 93 | 98 |
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Operations and maintenance | (751) | (2,391) |
Accumulated Defined Benefit Plans Adjustment | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Income before income taxes | (658) | (2,293) |
Income Tax Expense (Benefit) | 198 | 638 |
Net income | $ (460) | $ (1,655) |

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