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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Revenues      
Total Operating Revenues $ 890,107 $ 919,503 $ 916,447
Operating Expenses      
Electric Production Fuel 46,296 59,256 66,815
Electric Purchased Power 61,698 72,066 68,355
Electric Operating and Maintenance Expenses 150,848 153,529 155,534
Cost of Products Sold (excluding depreciation) 329,257 355,119 354,559
Other Nonelectric Expenses 55,051 50,782 51,544
Depreciation and Amortization 82,037 78,086 74,666
Electric Property Taxes 17,034 15,785 15,585
Total Operating Expenses 742,221 784,623 787,058
Operating Income 147,886 134,880 129,389
Other Income and Expense      
Interest Charges 34,447 31,411 30,408
Nonservice Cost Components of Postretirement Benefits 3,437 4,293 5,509
Other Income 6,055 5,112 3,461
Income Before Income Taxes 116,057 104,288 96,933
Income Tax Expense 20,206 17,441 14,588
Net Income $ 95,851 $ 86,847 $ 82,345
Weighted-Average Common Shares Outstanding:      
Basic (in shares) 40,710 39,721 39,600
Diluted (in shares) 40,905 39,954 39,892
Earnings Per Share:      
Basic (in dollars per share) $ 2.35 $ 2.19 $ 2.08
Diluted (in dollars per share) $ 2.34 $ 2.17 $ 2.06
Electric      
Operating Revenues      
Total Operating Revenues $ 446,088 $ 459,048 $ 450,198
Product Sales      
Operating Revenues      
Total Operating Revenues $ 444,019 $ 460,455 $ 466,249