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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Utility revenues:        
Utility revenues, exclusive of alternative revenue programs $ 389,587 $ 375,946 $ 1,381,959 $ 1,243,774
Alternative revenue programs 3,978 3,578 23,032 (9,947)
Total utility revenues 393,565 379,524 1,404,991 1,233,827
Non-utility revenues 177 102 239 367
Total operating revenues 393,742 379,626 1,405,230 1,234,194
Utility operating expenses:        
Resource costs 142,033 148,282 579,476 482,454
Other operating expenses 107,298 102,469 328,138 310,518
Depreciation and amortization 67,886 66,860 203,642 198,196
Taxes other than income taxes 27,438 23,280 88,836 82,091
Non-utility operating expenses 319 648 998 2,439
Total operating expenses 344,974 341,539 1,201,090 1,075,698
Income from operations 48,768 38,087 204,140 158,496
Interest expense 36,675 34,827 109,503 104,929
Interest expense to affiliated trust 651 657 1,964 1,836
Capitalized interest (1,306) (926) (3,412) (2,634)
Other income-net (5,261) (7,401) (19,078) (16,456)
Income before income taxes 18,009 10,930 115,163 70,821
Income tax expense (benefit) (478) (3,786) 2,323 (16,224)
Net income $ 18,487 $ 14,716 $ 112,840 $ 87,045
Weighted-average common shares outstanding (thousands), basic 78,836 76,734 78,463 75,962
Weighted-average common shares outstanding (thousands), diluted 78,968 76,761 78,545 76,056
Earnings per common share:        
Basic $ 0.23 $ 0.19 $ 1.44 $ 1.15
Diluted $ 0.23 $ 0.19 $ 1.44 $ 1.14