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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Revenues      
Total Operating Revenues $ 1,196,844 $ 890,107 $ 919,503
Operating Expenses      
Electric Production Fuel 59,327 46,296 59,256
Electric Purchased Power 65,409 61,698 72,066
Electric Operating and Maintenance Expenses 159,669 150,848 153,529
Cost of Products Sold (excluding depreciation) 488,370 329,257 355,119
Other Nonelectric Expenses 65,394 55,051 50,782
Depreciation and Amortization 91,358 82,037 78,086
Electric Property Taxes 17,609 17,034 15,785
Total Operating Expenses 947,136 742,221 784,623
Operating Income 249,708 147,886 134,880
Other Income and Expense      
Interest Charges 37,771 34,447 31,411
Nonservice Cost Components of Postretirement Benefits 2,016 3,437 4,293
Other Income (Expense), net 2,900 6,055 5,112
Income Before Income Taxes 212,821 116,057 104,288
Income Tax Expense 36,052 20,206 17,441
Net Income $ 176,769 $ 95,851 $ 86,847
Weighted-Average Common Shares Outstanding:      
Basic (in shares) 41,491 40,710 39,721
Diluted (in shares) 41,818 40,905 39,954
Earnings Per Share:      
Basic (in dollars per share) $ 4.26 $ 2.35 $ 2.19
Diluted (in dollars per share) $ 4.23 $ 2.34 $ 2.17
Electric      
Operating Revenues      
Total Operating Revenues $ 480,321 $ 446,088 $ 459,048
Product Sales      
Operating Revenues      
Total Operating Revenues $ 716,523 $ 444,019 $ 460,455