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Consolidated Statements of Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Operating Revenues:    
Total Operating Revenues $ 234,747 $ 245,972
Operating Expenses    
Production Fuel – Electric 13,735 18,920
Electric Operation and Maintenance Expenses 40,615 38,382
Cost of Products Sold (depreciation included below) 85,879 90,582
Other Nonelectric Expenses 11,900 13,477
Depreciation and Amortization 20,399 19,131
Property Taxes – Electric 4,100 3,959
Total Operating Expenses 195,458 206,403
Operating Income 39,289 39,569
Interest Charges 8,123 7,826
Nonservice Cost Components of Postretirement Benefits 871 1,035
Other (Loss) Income (389) 1,244
Income Before Income Taxes 29,906 31,952
Income Tax Expense 5,638 5,628
Net Income $ 24,268 $ 26,324
Average Number of Common Shares Outstanding—Basic (in shares) 40,217,141 39,657,321
Average Number of Common Shares Outstanding—Diluted (in shares) 40,444,336 39,903,165
Basic Earnings Per Common Share (in dollars per share) $ 0.60 $ 0.66
Diluted Earnings Per Common Share (in dollars per share) $ 0.60 $ 0.66
Electricity [Member]    
Operating Revenues:    
Revenues from Contracts with Customers $ 119,957 $ 129,144
Changes in Accrued Revenues under Alternative Revenue Programs (87) (1,049)
Total Electric Revenues 119,870 128,095
Product [Member]    
Operating Revenues:    
Revenues from Contracts with Customers 114,877 117,877
Electricity, Purchased [Member]    
Operating Expenses    
Purchased Power – Electric System Use $ 18,830 $ 21,952