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CONSOLIDATED STATEMENTS OF INCOME (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Operating Revenues        
Total Operating Revenues $ 358,056 $ 383,856 $ 1,034,853 $ 1,158,800
Operating Expenses        
Electric Production Fuel 19,603 24,972 45,928 54,538
Electric Purchased Power 10,895 19,913 57,932 64,604
Electric Operating and Maintenance Expenses 43,534 39,799 134,604 126,460
Cost of Products Sold (excluding depreciation) 118,303 139,361 351,330 443,586
Other Nonelectric Expenses 15,863 16,524 51,433 50,981
Depreciation and Amortization 24,548 22,716 72,636 69,829
Electric Property Taxes 4,194 4,438 13,151 13,304
Total Operating Expenses 236,940 267,723 727,014 823,302
Operating Income 121,116 116,133 307,839 335,498
Other Income and (Expense)        
Interest Expense (9,175) (9,259) (28,285) (27,198)
Nonservice Components of Postretirement Benefits 2,289 52 7,122 824
Other Income (Expense), net 2,471 (174) 7,841 (802)
Income Before Income Taxes 116,701 106,752 294,517 308,322
Income Tax Expense 24,727 22,513 58,093 66,143
Net Income $ 91,974 $ 84,239 $ 236,424 $ 242,179
Weighted-Average Common Shares Outstanding:        
Basic (in shares) 41,680 41,600 41,663 41,582
Diluted (in shares) 42,058 41,974 42,028 41,930
Earnings Per Share:        
Basic (in dollars per share) $ 2.21 $ 2.02 $ 5.67 $ 5.82
Diluted (in dollars per share) $ 2.19 $ 2.01 $ 5.63 $ 5.78
Electric        
Operating Revenues        
Total Operating Revenues $ 130,326 $ 142,747 $ 395,997 $ 404,112
Product Sales        
Operating Revenues        
Total Operating Revenues $ 227,730 $ 241,109 $ 638,856 $ 754,688