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CONSOLIDATED STATEMENTS OF INCOME (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Operating Revenues        
Total Operating Revenues $ 337,716 $ 400,040 $ 676,797 $ 774,944
Operating Expenses        
Electric Production Fuel 14,833 14,714 26,326 29,567
Electric Purchased Power 5,212 24,162 47,037 44,691
Electric Operating and Maintenance Expenses 45,522 42,379 91,070 86,659
Cost of Products Sold (excluding depreciation) 120,658 152,466 233,027 304,225
Other Nonelectric Expenses 16,870 17,252 35,568 34,457
Depreciation and Amortization 24,232 23,566 48,089 47,113
Electric Property Taxes 4,336 4,435 8,957 8,866
Total Operating Expenses 231,663 278,974 490,074 555,578
Operating Income 106,053 121,066 186,723 219,366
Other Income and (Expense)        
Interest Expense (9,696) (8,991) (19,111) (17,939)
Nonservice Components of Postretirement Benefits 2,421 751 4,833 772
Other Income (Expense), net 3,253 (889) 5,370 (629)
Income Before Income Taxes 102,031 111,937 177,815 201,570
Income Tax Expense 20,062 26,000 33,365 43,630
Net Income $ 81,969 $ 85,937 $ 144,450 $ 157,940
Weighted-Average Common Shares Outstanding:        
Basic (in shares) 41,678 41,597 41,655 41,573
Diluted (in shares) 42,053 41,944 42,035 41,907
Earnings Per Share:        
Basic (in dollars per share) $ 1.97 $ 2.07 $ 3.47 $ 3.80
Diluted (in dollars per share) $ 1.95 $ 2.05 $ 3.44 $ 3.77
Electric        
Operating Revenues        
Total Operating Revenues $ 113,763 $ 130,949 $ 265,671 $ 261,365
Product Sales        
Operating Revenues        
Total Operating Revenues $ 223,953 $ 269,091 $ 411,126 $ 513,579