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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating Revenues      
Total Operating Revenues $ 1,460,209 $ 1,196,844 $ 890,107
Operating Expenses      
Electric Production Fuel 65,110 59,327 46,296
Electric Purchased Power 100,281 65,409 61,698
Electric Operating and Maintenance Expenses 181,378 159,669 150,848
Cost of Products Sold (excluding depreciation) 542,944 488,370 329,257
Other Nonelectric Expenses 69,718 65,394 55,051
Depreciation and Amortization 92,597 91,358 82,037
Electric Property Taxes 17,742 17,609 17,034
Total Operating Expenses 1,069,770 947,136 742,221
Operating Income 390,439 249,708 147,886
Other Income and Expense      
Interest Charges 36,016 37,771 34,447
Nonservice Cost Components of Postretirement Benefits (1,075) 2,016 3,437
Other Income (Expense), net 2,037 2,900 6,055
Income Before Income Taxes 357,535 212,821 116,057
Income Tax Expense 73,351 36,052 20,206
Net Income $ 284,184 $ 176,769 $ 95,851
Weighted-Average Common Shares Outstanding:      
Basic (in shares) 41,586 41,491 40,710
Diluted (in shares) 41,931 41,818 40,905
Earnings Per Share:      
Basic (in dollars per share) $ 6.83 $ 4.26 $ 2.35
Diluted (in dollars per share) $ 6.78 $ 4.23 $ 2.34
Electric      
Operating Revenues      
Total Operating Revenues $ 549,699 $ 480,321 $ 446,088
Product Sales      
Operating Revenues      
Total Operating Revenues $ 910,510 $ 716,523 $ 444,019