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CONSOLIDATED STATEMENTS OF EARNINGS - USD ($)
$ in Thousands, shares in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Revenues      
Total Operating Revenues $ 444,100 $ 406,200 $ 383,400
Operating Expenses      
Operation and Maintenance 69,500 64,500 61,400
Depreciation and Amortization 50,400 46,900 46,600
Taxes Other Than Income Taxes 22,400 21,100 19,600
Total Operating Expenses 372,900 330,800 313,200
Operating Income 71,200 75,400 70,200
Interest Expense, net 24,000 23,100 22,500
Other Expense (Income), net 5,800 5,800 5,200
Income Before Income Taxes 41,400 46,500 42,500
Income Taxes 8,393 17,537 15,354
Net Income Applicable to Common Shares $ 33,000 $ 29,000 $ 27,100
Earnings per Common Share-Basic and Diluted $ 2.23 $ 2.06 $ 1.94
Weighted Average Common Shares Outstanding-(Basic and Diluted) 14.8 14.1 14.0
Gas      
Operating Revenues      
Total Operating Revenues $ 216,100 $ 194,000 $ 181,200
Operating Expenses      
Operating Expenses 99,200 84,300 77,600
Electric      
Operating Revenues      
Total Operating Revenues 223,300 206,200 196,100
Operating Expenses      
Operating Expenses 131,400 114,000 108,000
Other      
Operating Revenues      
Total Operating Revenues $ 4,700 $ 6,000 $ 6,100