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Consolidated Statements of Income (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Operating Revenues    
Total Operating Revenues $ 374,904 $ 261,710
Operating Expenses    
Electric Production Fuel 14,853 14,714
Electric Purchased Power 20,529 19,260
Electric Operating and Maintenance Expenses 44,278 41,421
Cost of Products Sold (excluding depreciation) 151,759 101,977
Other Nonelectric Expenses 17,206 13,693
Depreciation and Amortization 23,548 22,126
Electric Property Taxes 4,432 4,320
Total Operating Expenses 276,605 217,511
Operating Income 98,299 44,199
Other Income and Expense    
Interest Charges 8,948 9,398
Nonservice Cost Components of Postretirement Benefits (22) 383
Other Income (Expense), net 260 1,160
Income Before Income Taxes 89,633 35,578
Income Tax Expense 17,630 5,249
Net Income $ 72,003 $ 30,329
Weighted-Average Common Shares Outstanding:    
Basic (in shares) 41,548 41,455
Diluted (in shares) 41,871 41,700
Earnings Per Share:    
Basic (in dollars per share) $ 1.73 $ 0.73
Diluted (in dollars per share) $ 1.72 $ 0.73
Electric    
Operating Revenues    
Total Operating Revenues $ 130,416 $ 123,699
Product Sales    
Operating Revenues    
Total Operating Revenues $ 244,488 $ 138,011