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CONSOLIDATED STATEMENTS OF INCOME (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating Revenues    
Total Operating Revenues $ 339,081 $ 374,904
Operating Expenses    
Electric Production Fuel 11,492 14,853
Electric Purchased Power 41,825 20,529
Electric Operating and Maintenance Expenses 45,549 44,278
Cost of Products Sold (excluding depreciation) 112,369 151,759
Other Nonelectric Expenses 18,699 17,206
Depreciation and Amortization 23,856 23,548
Electric Property Taxes 4,621 4,432
Total Operating Expenses 258,411 276,605
Operating Income 80,670 98,299
Other Income and (Expense)    
Interest Expense (9,415) (8,948)
Nonservice Components of Postretirement Benefits 2,412 22
Other Income (Expense), net 2,118 260
Income Before Income Taxes 75,785 89,633
Income Tax Expense 13,304 17,630
Net Income $ 62,481 $ 72,003
Weighted-Average Common Shares Outstanding:    
Basic (in shares) 41,632 41,548
Diluted (in shares) 41,977 41,871
Earnings Per Share:    
Basic (in dollars per share) $ 1.50 $ 1.73
Diluted (in dollars per share) $ 1.49 $ 1.72
Electric    
Operating Revenues    
Total Operating Revenues $ 151,909 $ 130,416
Product Sales    
Operating Revenues    
Total Operating Revenues $ 187,172 $ 244,488