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CONSOLIDATED STATEMENTS OF EARNINGS - USD ($)
$ in Thousands, shares in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Revenues      
Total Operating Revenues $ 418,600 $ 438,200 $ 444,100
Operating Expenses      
Operation and Maintenance 65,700 67,200 69,500
Depreciation and Amortization 54,500 52,000 50,400
Taxes Other Than Income Taxes 23,900 22,700 22,400
Total Operating Expenses 347,200 365,100 372,900
Operating Income 71,400 73,100 71,200
Interest Expense, Net 23,800 23,700 24,000
Other Expense (Income), Net 5,200 (8,600) 5,800
Income Before Income Taxes 42,400 58,000 41,400
Provision for Income Taxes 10,249 13,808 8,393
Net Income Applicable to Common Shares $ 32,200 $ 44,200 $ 33,000
Earnings per Common Share—Basic and Diluted $ 2.15 $ 2.97 $ 2.23
Weighted Average Common Shares Outstanding—(Basic and Diluted) 15.0 14.9 14.8
Gas      
Operating Revenues      
Total Operating Revenues $ 191,400 $ 203,400 $ 216,100
Operating Expenses      
Total Operating Expenses 68,800 81,200 99,200
Electric      
Operating Revenues      
Total Operating Revenues 227,200 233,900 223,300
Operating Expenses      
Total Operating Expenses $ 134,300 142,000 131,400
Other      
Operating Revenues      
Total Operating Revenues   $ 900 $ 4,700