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Condensed Consolidated Statements of Income (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Income Statement [Abstract]        
Revenues $ 462,612 $ 380,590 $ 1,760,377 $ 1,386,594
Operating expenses:        
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
Depreciation, depletion and amortization 64,019 59,159 188,610 174,871
Taxes - property and production 16,130 15,224 49,365 45,390
Total operating expenses 383,133 290,717 1,435,156 1,091,140
Operating income 79,479 89,873 325,221 295,454
Other income (expense):        
Interest expense incurred net of amounts capitalized (including amortization of debt issuance costs, premiums and discounts) (40,580) (38,604) (118,454) (115,098)
Interest income 561 586 1,126 1,278
Other income, net 464 1,560 2,731 1,635
Total other income (expense) (39,555) (36,458) (114,597) (112,185)
Income before income taxes 39,924 53,415 210,624 183,269
Income tax (expense) (2,090) (5,253) (15,920) (6,333)
Net income 37,834 48,162 194,704 176,936
Net income attributable to non-controlling interest (2,861) (4,050) (8,790) (11,347)
Net income available for common stock $ 34,973 $ 44,112 $ 185,914 $ 165,589
Earnings per share of common stock:        
Earnings per share, Basic (usd per share) $ 0.54 $ 0.70 $ 2.87 $ 2.63
Earnings per share, Diluted (usd per share) $ 0.54 $ 0.70 $ 2.86 $ 2.63
Weighted average common shares outstanding:        
Basic (in shares) 64,876 63,341 64,722 62,950
Diluted (in shares) 65,061 63,436 64,910 63,046