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Consolidated Statements of Earnings (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating Revenues:      
Gas $ 170,400,000 $ 160,600,000 $ 159,200,000
Electric 190,700,000 187,000,000 188,100,000
Other 5,800,000 5,500,000 5,500,000
Total Operating Revenues 366,900,000 353,100,000 352,800,000
Operating Expenses:      
Cost of Gas Sales 85,200,000 84,400,000 91,300,000
Cost of Electric Sales 114,500,000 115,100,000 120,500,000
Operation and Maintenance 61,000,000 57,000,000 51,500,000
Depreciation and Amortization 37,700,000 35,100,000 29,300,000
Taxes Other Than Income Taxes 15,000,000 14,000,000 13,000,000
Total Operating Expenses 313,400,000 305,600,000 305,600,000
Operating Income 53,500,000 47,500,000 47,200,000
Interest Expense, net 18,800,000 18,100,000 20,400,000
Other Expense (Income), net 400,000 200,000 400,000
Income Before Income Taxes 34,300,000 29,200,000 26,400,000
Income Taxes 12,652,000 10,976,000 10,025,000
Net Income 21,600,000 18,200,000 16,400,000
Less Dividends on Preferred Stock   100,000 100,000
Earnings Applicable to Common Shareholders $ 21,600,000 $ 18,100,000 $ 16,300,000
Earnings per Common Share-Basic and Diluted $ 1.57 $ 1.43 $ 1.50
Average Common Shares Outstanding-Basic 13,772,855 12,669,309 10,880,025
Average Common Shares Outstanding-Diluted 13,775,245 12,671,609 10,882,971