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Consolidated Statements of Earnings (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Revenues:      
Gas $ 160.6 $ 159.2 $ 150.1
Electric 187.0 188.1 203.7
Other 5.5 5.5 4.6
Total Operating Revenues 353.1 352.8 358.4
Operating Expenses:      
Purchased Gas 81.9 89.1 90.5
Purchased Electricity 108.4 114.2 137.7
Operation and Maintenance 57.0 51.5 48.8
Conservation & Load Management 9.2 8.5 8.8
Depreciation and Amortization 35.1 29.3 28.9
Provisions for Taxes:      
Local Property and Other 14.0 13.0 11.2
Federal and State Income 11.0 10.0 4.5
Total Operating Expenses 316.6 315.6 330.4
Operating Income 36.5 37.2 28.0
Other Non-Operating Expenses 0.2 0.4 0.3
Income Before Interest Expense 36.3 36.8 27.7
Interest Expense, net 18.1 20.4 18.1
Net Income 18.2 16.4 9.6
Less Dividends on Preferred Stock 0.1 0.1 0.1
Earnings Applicable to Common Shareholders $ 18.1 $ 16.3 $ 9.5
Average Common Shares Outstanding (000's)-Basic 12,669 10,880 10,823
Average Common Shares Outstanding (000's)-Diluted 12,672 10,883 10,824
Earnings per Common Share-Basic and Diluted $ 1.43 $ 1.50 $ 0.88