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CONSOLIDATED STATEMENTS OF INCOME (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Operating Revenues        
Total Operating Revenues $ 338,033 $ 358,056 $ 1,027,437 $ 1,034,853
Operating Expenses        
Electric Production Fuel 14,991 19,603 45,009 45,928
Electric Purchased Power 10,735 10,895 42,507 57,932
Electric Operating and Maintenance Expenses 43,737 43,534 136,367 134,604
Cost of Products Sold (excluding depreciation) 111,444 118,303 342,962 351,330
Nonelectric Selling, General, and Administrative Expenses 18,829 15,863 55,896 51,433
Depreciation and Amortization 27,051 24,548 79,579 72,636
Electric Property Taxes 3,705 4,194 11,691 13,151
Total Operating Expenses 230,492 236,940 714,011 727,014
Operating Income 107,541 121,116 313,426 307,839
Other Income and (Expense)        
Interest Expense (11,173) (9,175) (31,225) (28,285)
Nonservice Components of Postretirement Benefits 2,367 2,289 7,197 7,122
Other Income (Expense), net 5,421 2,471 14,491 7,841
Income Before Income Taxes 104,156 116,701 303,889 294,517
Income Tax Expense 18,677 24,727 57,077 58,093
Net Income $ 85,479 $ 91,974 $ 246,812 $ 236,424
Weighted-Average Common Shares Outstanding:        
Basic (in shares) 41,800 41,680 41,770 41,663
Diluted (in shares) 42,081 42,058 42,068 42,028
Earnings Per Share:        
Basic (in dollars per share) $ 2.04 $ 2.21 $ 5.91 $ 5.67
Diluted (in dollars per share) $ 2.03 $ 2.19 $ 5.87 $ 5.63
Electric        
Operating Revenues        
Total Operating Revenues $ 130,380 $ 130,326 $ 384,696 $ 395,997
Product Sales        
Operating Revenues        
Total Operating Revenues $ 207,653 $ 227,730 $ 642,741 $ 638,856