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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)