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CONSOLIDATED STATEMENTS OF INCOME (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating Revenues    
Total Operating Revenues $ 347,068 $ 339,081
Operating Expenses    
Electric Production Fuel 17,694 11,492
Electric Purchased Power 22,521 41,825
Electric Operating and Maintenance Expenses 47,977 45,549
Cost of Products Sold (excluding depreciation) 114,723 112,369
Nonelectric Selling, General, and Administrative Expenses 18,914 18,699
Depreciation and Amortization 25,897 23,856
Electric Property Taxes 4,367 4,621
Total Operating Expenses 252,093 258,411
Operating Income 94,975 80,670
Other Income and (Expense)    
Interest Expense (9,850) (9,415)
Nonservice Components of Postretirement Benefits 2,442 2,412
Other Income (Expense), net 4,579 2,118
Income Before Income Taxes 92,146 75,785
Income Tax Expense 17,808 13,304
Net Income $ 74,338 $ 62,481
Weighted-Average Common Shares Outstanding:    
Basic (in shares) 41,724 41,632
Diluted (in shares) 42,033 41,977
Earnings Per Share:    
Basic (in dollars per share) $ 1.78 $ 1.50
Diluted (in dollars per share) $ 1.77 $ 1.49
Electric    
Operating Revenues    
Total Operating Revenues $ 141,488 $ 151,909
Product Sales    
Operating Revenues    
Total Operating Revenues $ 205,580 $ 187,172