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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating Revenues      
Total Operating Revenues $ 1,330,548 $ 1,349,166 $ 1,460,209
Operating Expenses      
Electric Production Fuel 60,945 60,339 65,110
Electric Purchased Power 61,561 78,292 100,281
Electric Operating and Maintenance Expenses 190,422 191,263 181,378
Cost of Products Sold (excluding depreciation) 434,522 454,122 542,944
Nonelectric Selling, General, and Administrative Expenses 80,065 72,663 69,718
Depreciation and Amortization 107,121 97,954 92,597
Electric Property Taxes 15,662 16,614 17,742
Total Operating Expenses 950,298 971,247 1,069,770
Operating Income 380,250 377,919 390,439
Other Income and (Expense)      
Interest Expense (41,815) (37,677) (36,016)
Nonservice Cost Components of Postretirement Benefits 9,609 10,597 1,075
Other Income (Expense), net 18,848 12,650 2,037
Income Before Income Taxes 366,892 363,489 357,535
Income Tax Expense 65,230 69,298 73,351
Net Income $ 301,662 $ 294,191 $ 284,184
Weighted-Average Common Shares Outstanding:      
Basic (in shares) 41,778 41,668 41,586
Diluted (in shares) 42,072 42,039 41,931
Earnings Per Share:      
Basic (in dollars per share) $ 7.22 $ 7.06 $ 6.83
Diluted (in dollars per share) $ 7.17 $ 7.00 $ 6.78
Electric      
Operating Revenues      
Total Operating Revenues $ 524,515 $ 528,359 $ 549,699
Product Sales      
Operating Revenues      
Total Operating Revenues $ 806,033 $ 820,807 $ 910,510