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Other Comprehensive Income: Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |
Interest expense | $ 43,267 |  | $ 39,053 |  | $ 87,332 | $ 77,874
Fuel, purchased power and cost of natural gas sold | 121,245 |  | 188,171 |  | 647,512 | 625,097
Operations and maintenance | 145,767 |  | 132,968 |  | 286,755 | 269,100
Income Tax Expense (Benefit) | 6,089 |  | 658 |  | (8,584) | (13,830)
Net income | 26,544 | $ 117,380 | 35,846 | $ 121,024 | 143,924 | 156,870
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |
Operations and maintenance | 0 |  | 22 |  | 0 | 46
Net income | (923) |  | 424 |  | (2,998) | 1,465
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 | (1,202) |  | 610 |  | (3,865) | 2,151
Income Tax Expense (Benefit) | 295 |  | (81) |  | 911 | (456)
Net income | (907) |  | 529 |  | (2,954) | 1,695
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 | (713) |  | (713) |  | (1,426) | (1,426)
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 | (489) |  | 1,323 |  | (2,439) | 3,577
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 | (43) |  | (187) |  | (87) | (375)
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 | (43) |  | (165) |  | (87) | (329)
Income Tax Expense (Benefit) | 27 |  | 60 |  | 43 | 99
Net income | $ (16) |  | $ (105) |  | $ (44) | $ (230)

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