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CONSOLIDATED STATEMENTS OF INCOME (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Operating Revenues    
Total Operating Revenues $ 337,353 $ 347,068
Operating Expenses    
Electric Production Fuel 14,321 17,694
Electric Purchased Power 30,870 22,521
Electric Operating and Maintenance Expenses 48,881 47,977
Cost of Products Sold (excluding depreciation) 104,387 114,723
Nonelectric Selling, General, and Administrative Expenses 21,292 18,914
Depreciation and Amortization 29,375 25,897
Electric Property Taxes 4,228 4,367
Total Operating Expenses 253,354 252,093
Operating Income 83,999 94,975
Other Income and (Expense)    
Interest Expense (11,553) (9,850)
Nonservice Components of Postretirement Benefits 1,282 2,442
Other Income (Expense), net 4,456 4,579
Income Before Income Taxes 78,184 92,146
Income Tax Expense 10,085 17,808
Net Income $ 68,099 $ 74,338
Weighted-Average Common Shares Outstanding:    
Basic (in shares) 41,826 41,724
Diluted (in shares) 42,062 42,033
Earnings Per Share:    
Basic (in dollars per share) $ 1.63 $ 1.78
Diluted (in dollars per share) $ 1.62 $ 1.77
Electric    
Operating Revenues    
Total Operating Revenues $ 149,720 $ 141,488
Product Sales    
Operating Revenues    
Total Operating Revenues $ 187,633 $ 205,580