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Consolidated Statements of Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Operating Revenues:        
Total Operating Revenues $ 192,756 $ 229,203 $ 427,503 $ 475,175
Operating Expenses        
Production Fuel – Electric 8,788 8,296 22,523 27,216
Electric Operation and Maintenance Expenses 33,179 39,856 73,794 78,238
Cost of Products Sold (depreciation included below) 73,832 97,996 159,711 188,578
Other Nonelectric Expenses 10,762 13,262 22,662 26,739
Depreciation and Amortization 20,436 19,441 40,835 38,572
Property Taxes – Electric 4,168 3,900 8,268 7,859
Total Operating Expenses 164,847 202,384 360,305 408,787
Operating Income 27,909 26,819 67,198 66,388
Interest Charges 8,662 7,825 16,785 15,651
Nonservice Cost Components of Postretirement Benefits 868 1,075 1,739 2,110
Other Income 2,410 850 2,021 2,094
Income Before Income Taxes 20,789 18,769 50,695 50,721
Income Tax Expense 3,808 3,343 9,446 8,971
Net Income $ 16,981 $ 15,426 $ 41,249 $ 41,750
Average Number of Common Shares Outstanding – Basic (in shares) 40,513,286 39,712,036 40,365,214 39,684,679
Average Number of Common Shares Outstanding – Diluted (in shares) 40,676,761 39,917,831 40,560,549 39,910,499
Basic Earnings Per Common Share (in dollars per share) $ 0.42 $ 0.39 $ 1.02 $ 1.05
Diluted Earnings Per Common Share (in dollars per share) $ 0.42 $ 0.39 $ 1.02 $ 1.05
Electricity [Member]        
Operating Revenues:        
Revenues from Contracts with Customers $ 97,921 $ 101,861 $ 217,878 $ 231,006
Changes in Accrued Revenues under Alternative Revenue Programs 209 369 122 (680)
Total Electric Revenues 98,130 102,230 218,000 230,326
Product [Member]        
Operating Revenues:        
Revenues from Contracts with Customers 94,626 126,973 209,503 244,849
Electricity, Purchased [Member]        
Operating Expenses        
Purchased Power – Electric System Use $ 13,682 $ 19,633 $ 32,512 $ 41,585