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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenue:        
Revenue $ 407,126 $ 462,612 $ 1,739,568 $ 1,760,377
Operating expenses:        
Fuel, purchased power and cost of natural gas sold 102,241 168,535 749,753 793,632
Operations and maintenance 125,767 134,449 412,522 403,549
Depreciation, depletion and amortization 64,878 64,019 191,235 188,610
Taxes - property and production 16,469 16,130 49,888 49,365
Total operating expenses 309,355 383,133 1,403,398 1,435,156
Operating income 97,771 79,479 336,170 325,221
Other income (expense):        
Interest expense incurred net of amounts capitalized (44,477) (40,580) (131,809) (118,454)
Interest income 3,479 561 5,786 1,126
Other income (expense), net (647) 464 (1,513) 2,731
Total other income (expense) (41,645) (39,555) (127,536) (114,597)
Income before income taxes 56,126 39,924 208,634 210,624
Income tax (expense) (7,366) (2,090) (15,950) (15,920)
Net income 48,760 37,834 192,684 194,704
Net income attributable to non-controlling interest (3,377) (2,861) (10,164) (8,790)
Net income available for common stock $ 45,383 $ 34,973 $ 182,520 $ 185,914
Earnings per share of common stock:        
Earnings per share, Basic (usd per share) $ 0.67 $ 0.54 $ 2.74 $ 2.87
Earnings per share, Diluted (usd per share) $ 0.67 $ 0.54 $ 2.74 $ 2.86
Weighted average common shares outstanding:        
Basic (in shares) 67,315 64,876 66,652 64,722
Diluted (in shares) 67,389 65,061 66,725 64,910