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Other Comprehensive Income: Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Interest Expense | $ 40,580 |  |  | $ 38,604 |  |  | $ 118,454 | $ 115,098
Fuel, purchased power and cost of natural gas sold | 168,535 |  |  | 94,057 |  |  | 793,632 | 495,678
Operations and maintenance | 134,449 |  |  | 122,277 |  |  | 403,549 | 375,201
Income tax benefit (expense) | (2,090) |  |  | (5,253) |  |  | (15,920) | (6,333)
Net income (loss) | 37,834 | $ 35,846 | $ 121,024 | 48,162 | $ 28,287 | $ 100,487 | 194,704 | 176,936
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Net income (loss) | (651) |  |  | (847) |  |  | 814 | (2,701)
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Income before Income Taxes | (669) |  |  | (381) |  |  | 1,482 | (1,782)
Income tax benefit (expense) | 124 |  |  | (26) |  |  | (332) | 308
Net income (loss) | (545) |  |  | (407) |  |  | 1,150 | (1,474)
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Interest rate swaps |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Interest Expense | (712) |  |  | (712) |  |  | (2,138) | (2,138)
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Commodity Contract |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Fuel, purchased power and cost of natural gas sold | 43 |  |  | 331 |  |  | 3,620 | 356
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Operations and maintenance | 24 |  |  | 25 |  |  | 70 | 74
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Operations and maintenance | (188) |  |  | (598) |  |  | (563) | (1,793)
Accumulated Defined Benefit Plans Adjustment | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Income before Income Taxes | (164) |  |  | (573) |  |  | (493) | (1,719)
Income tax benefit (expense) | 58 |  |  | 133 |  |  | 157 | 492
Net income (loss) | $ (106) |  |  | $ (440) |  |  | $ (336) | $ (1,227)

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