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Consolidated Statements of Income (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Operating Revenues        
Total Operating Revenues $ 316,294 $ 235,755 $ 863,612 $ 663,258
Operating Expenses        
Electric Production Fuel 17,698 11,554 44,576 34,077
Electric Purchased Power 9,878 13,428 40,273 45,940
Electric Operating and Maintenance Expenses 36,465 32,845 114,615 106,639
Cost of Products Sold (excluding depreciation) 134,212 86,856 358,767 246,567
Other Nonelectric Expenses 16,224 13,615 45,587 36,277
Depreciation and Amortization 22,815 20,395 68,109 61,230
Electric Property Taxes 4,474 4,333 13,136 12,601
Total Operating Expenses 241,766 183,026 685,063 543,331
Operating Income 74,528 52,729 178,549 119,927
Other Income and Expense        
Interest Charges 9,648 8,568 28,601 25,353
Nonservice Cost Components of Postretirement Benefits 505 842 1,511 2,581
Other Income (Expense), net 203 1,712 2,095 3,733
Income Before Income Taxes 64,578 45,031 150,532 95,726
Income Tax Expense 11,824 9,097 25,380 18,543
Net Income $ 52,754 $ 35,934 $ 125,152 $ 77,183
Weighted-Average Common Shares Outstanding:        
Basic (in shares) 41,504 40,914 41,487 40,548
Diluted (in shares) 41,869 41,078 41,795 40,733
Earnings Per Share:        
Basic (in dollars per share) $ 1.27 $ 0.88 $ 3.02 $ 1.90
Diluted (in dollars per share) $ 1.26 $ 0.87 $ 2.99 $ 1.89
Electric        
Operating Revenues        
Total Operating Revenues $ 118,775 $ 115,213 $ 348,629 $ 333,213
Product Sales        
Operating Revenues        
Total Operating Revenues $ 197,519 $ 120,542 $ 514,983 $ 330,045