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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating Revenues    
Total Operating Revenues $ 261,710 $ 234,747
Operating Expenses    
Electric Production Fuel 14,714 13,735
Electric Purchased Power 19,260 18,830
Electric Operating and Maintenance Expenses 41,421 40,615
Cost of Products Sold (excluding depreciation) 101,977 85,879
Other Nonelectric Expenses 13,693 11,900
Depreciation and Amortization 22,126 20,399
Electric Property Taxes 4,320 4,100
Total Operating Expenses 217,511 195,458
Operating Income 44,199 39,289
Other Income and Expense    
Interest Charges 9,398 8,123
Nonservice Cost Components of Postretirement Benefits 383 871
Other Income (Expense) 1,160 (389)
Income Before Income Taxes 35,578 29,906
Income Tax Expense 5,249 5,638
Net Income $ 30,329 $ 24,268
Weighted-Average Common Shares Outstanding:    
Basic (in shares) 41,455 40,217
Diluted (in shares) 41,700 40,444
Earnings Per Share:    
Basic (in dollars per share) $ 0.73 $ 0.60
Diluted (in dollars per share) $ 0.73 $ 0.60
Electric    
Operating Revenues    
Total Operating Revenues $ 123,699 $ 119,870
Product Sales    
Operating Revenues    
Total Operating Revenues $ 138,011 $ 114,877