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Consolidated Statements of Income (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Operating Revenues        
Total Operating Revenues $ 400,040 $ 285,608 $ 774,944 $ 547,318
Operating Expenses        
Electric Production Fuel 14,714 12,164 29,567 26,878
Electric Purchased Power 24,162 11,135 44,691 30,395
Electric Operating and Maintenance Expenses 42,379 36,729 86,659 78,150
Cost of Products Sold (excluding depreciation) 152,466 122,578 304,225 224,555
Other Nonelectric Expenses 17,252 15,669 34,457 29,362
Depreciation and Amortization 23,566 23,169 47,113 45,295
Electric Property Taxes 4,435 4,342 8,866 8,662
Total Operating Expenses 278,974 225,786 555,578 443,297
Operating Income 121,066 59,822 219,366 104,021
Other Income and Expense        
Interest Charges 8,991 9,555 17,939 18,953
Nonservice Cost Components of Postretirement Benefits (751) 624 (772) 1,006
Other Income (Expense), net (889) 734 (629) 1,892
Income Before Income Taxes 111,937 50,377 201,570 85,954
Income Tax Expense 26,000 8,308 43,630 13,556
Net Income $ 85,937 $ 42,069 $ 157,940 $ 72,398
Weighted-Average Common Shares Outstanding:        
Basic (in shares) 41,597 41,500 41,573 41,478
Diluted (in shares) 41,944 41,818 41,907 41,759
Earnings Per Share:        
Basic (in dollars per share) $ 2.07 $ 1.01 $ 3.80 $ 1.75
Diluted (in dollars per share) $ 2.05 $ 1.01 $ 3.77 $ 1.73
Electric        
Operating Revenues        
Total Operating Revenues $ 130,949 $ 106,155 $ 261,365 $ 229,855
Product Sales        
Operating Revenues        
Total Operating Revenues $ 269,091 $ 179,453 $ 513,579 $ 317,463