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Condensed Consolidated Statements of Income (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Income Statement [Abstract]    
Revenues $ 823,570 $ 633,432
Operating expenses:    
Fuel, purchased power and cost of natural gas sold 436,926 293,147
Operations and maintenance 136,132 129,679
Depreciation, depletion and amortization 60,463 57,269
Taxes - property and production 16,696 15,022
Total operating expenses 650,217 495,117
Operating income 173,353 138,315
Other income (expense):    
Interest expense incurred net of amounts capitalized (including amortization of debt issuance costs, premiums and discounts) (38,821) (37,825)
Interest income 276 225
Other income, net 704 266
Total other income (expense) (37,841) (37,334)
Income before income taxes 135,512 100,981
Income tax expense (14,488) (494)
Net income 121,024 100,487
Net income attributable to non-controlling interest (3,498) (4,171)
Net income available for common stock $ 117,526 $ 96,316
Earnings per share of common stock:    
Earnings per share, Basic (usd per share) $ 1.82 $ 1.54
Earnings per share, Diluted (usd per share) $ 1.82 $ 1.54
Weighted average common shares outstanding:    
Basic (in shares) 64,565 62,633
Diluted (in shares) 64,721 62,691