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CONSOLIDATED STATEMENTS OF INCOME (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Operating Revenues        
Total Operating Revenues $ 383,856 $ 316,294 $ 1,158,800 $ 863,612
Operating Expenses        
Electric Production Fuel 24,972 17,698 54,538 44,576
Electric Purchased Power 19,913 9,878 64,604 40,273
Electric Operating and Maintenance Expenses 39,799 36,465 126,460 114,615
Cost of Products Sold (excluding depreciation) 139,361 134,212 443,586 358,767
Other Nonelectric Expenses 16,524 16,224 50,981 45,587
Depreciation and Amortization 22,716 22,815 69,829 68,109
Electric Property Taxes 4,438 4,474 13,304 13,136
Total Operating Expenses 267,723 241,766 823,302 685,063
Operating Income 116,133 74,528 335,498 178,549
Other Income and Expense        
Interest Charges 9,259 9,648 27,198 28,601
Nonservice Cost Components of Postretirement Benefits (52) 505 (824) 1,511
Other Income (Expense), net (174) 203 (802) 2,095
Income Before Income Taxes 106,752 64,578 308,322 150,532
Income Tax Expense 22,513 11,824 66,143 25,380
Net Income $ 84,239 $ 52,754 $ 242,179 $ 125,152
Weighted-Average Common Shares Outstanding:        
Basic (in shares) 41,600 41,504 41,582 41,487
Diluted (in shares) 41,974 41,869 41,930 41,795
Earnings Per Share:        
Basic (in dollars per share) $ 2.02 $ 1.27 $ 5.82 $ 3.02
Diluted (in dollars per share) $ 2.01 $ 1.26 $ 5.78 $ 2.99
Electric        
Operating Revenues        
Total Operating Revenues $ 142,747 $ 118,775 $ 404,112 $ 348,629
Product Sales        
Operating Revenues        
Total Operating Revenues $ 241,109 $ 197,519 $ 754,688 $ 514,983