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CONDENSED 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
Utility revenues:        
Utility revenues, exclusive of alternative revenue programs $ 375,946 $ 365,142 $ 1,243,774 $ 1,228,059
Alternative revenue programs 3,578 (5,850) (9,947) (28,420)
Total utility revenues 379,524 359,292 1,233,827 1,199,639
Non-utility revenues 102 154 367 419
Total operating revenues 379,626 359,446 1,234,194 1,200,058
Utility operating expenses:        
Resource costs 148,282 147,784 482,454 492,049
Other operating expenses 102,469 101,701 310,518 300,710
Depreciation and amortization 66,860 63,484 198,196 188,867
Taxes other than income taxes 23,280 26,002 82,091 86,777
Non-utility operating expenses 648 1,073 2,439 5,001
Total operating expenses 341,539 340,044 1,075,698 1,073,404
Income from operations 38,087 19,402 158,496 126,654
Capitalized interest (926) (828) (2,634) (2,853)
Other income-net (7,401) (3,964) (16,456) (22,749)
Income (loss) before income taxes 10,930 (5,641) 70,821 65,542
Income tax expense (benefit) (3,786) 157 (16,224) (11,678)
Net income (loss) $ 14,716 $ (5,798) $ 87,045 $ 77,220
Weighted-average common shares outstanding (thousands), basic 76,734 73,229 75,962 72,547
Weighted-average common shares outstanding (thousands), diluted 76,761 73,298 76,056 72,629
Earnings (loss) per common share:        
Basic $ 0.19 $ (0.08) $ 1.15 $ 1.06
Diluted $ 0.19 $ (0.08) $ 1.14 $ 1.06
Non Affiliated Trusts [Member]        
Utility operating expenses:        
Interest expense $ 34,827 $ 29,533 $ 104,929 $ 86,118
Affiliated Trusts [Member]        
Utility operating expenses:        
Interest expense $ 657 $ 302 $ 1,836 $ 596