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Other Comprehensive Income: Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Condensed Statement of Income Captions [Line Items]    
Interest Expense $ 38,821 $ 37,825
Fuel, purchased power and cost of natural gas sold 436,926 293,147
Operations and maintenance 136,132 129,679
Income tax benefit (expense) (14,488) (494)
Net income (loss) 121,024 100,487
Reclassification out of Accumulated Other Comprehensive Income    
Condensed Statement of Income Captions [Line Items]    
Net income (loss) 1,041 (911)
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income    
Condensed Statement of Income Captions [Line Items]    
Income before Income Taxes 1,541 (744)
Income tax benefit (expense) (375) 198
Net income (loss) 1,166 (546)
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Interest rate swaps    
Condensed Statement of Income Captions [Line Items]    
Interest Expense (713) (713)
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 2,254 (31)
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
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)
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)
Income tax benefit (expense) 39 208
Net income (loss) $ (125) $ (365)