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Condensed Consolidated Statements of Income (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Revenues    
Revenues $ 744,070 $ 792,014
Expenses    
Total expenses 681,650 741,127
Operating income (loss)    
Operating income 62,420 50,887
Retirement defined benefits credit—other than service costs 917 1,001
Interest expense, net (34,212) (31,591)
Allowance for borrowed funds used during construction 1,417 1,386
Allowance for equity funds used during construction 3,585 3,640
Interest income 12,623 3,133
Loss on sale of a subsidiary (13,211) 0
Income before income taxes 33,539 28,456
Income tax expense 6,395 6,795
Income from continuing operations for common stock 27,144 21,661
Preferred stock dividends of subsidiaries 473 473
Income from continuing operations for common stock 26,671 21,188
Income from discontinued operations 0 20,934
Net income for common stock $ 26,671 $ 42,122
Continuing operations - Basic earnings per common share (in dollars per share) $ 0.15 $ 0.19
Discontinued operations - Basic earnings per common share (in dollars per share) 0 0.19
Basic earnings per common share (in dollars per share) 0.15 0.38
Continuing operations - Diluted earnings per common share (in dollars per share) 0.15 0.19
Discontinued operations - Diluted earnings per common share (in dollars per share) 0 0.19
Diluted earnings per common share (in dollars per share) $ 0.15 $ 0.38
Weighted-average number of common shares outstanding:    
Basic (in shares) 172,478 110,218
Diluted (in shares) 172,812 110,476
Electric Utility    
Revenues    
Revenues $ 738,366 $ 788,578
Expenses    
Total expenses 662,429 725,223
Operating income (loss)    
Operating income 75,937 63,355
Other    
Revenues    
Revenues 5,704 3,436
Expenses    
Total expenses 19,221 15,904
Operating income (loss)    
Operating income $ (13,517) $ (12,468)