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Condensed Consolidated Statements of Income (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Operating Revenues        
Regulated Energy $ 55,553 $ 54,193 $ 127,849 $ 139,063
Unregulated Energy 25,176 29,692 70,063 88,442
Other 3,168 2,946 6,899 5,924
Total operating revenues 83,897 86,831 204,811 233,429
Operating Expenses        
Regulated energy cost of sales 23,433 24,882 59,105 72,872
Unregulated energy and other cost of sales 19,861 24,420 54,453 68,711
Operations 20,071 20,401 40,027 40,237
Maintenance 1,858 1,892 3,834 3,595
Depreciation and amortization 5,885 4,937 11,646 9,958
Other taxes 2,334 2,523 5,218 5,441
Total operating expenses 73,442 79,055 174,283 200,814
Operating Income 10,455 7,776 30,528 32,615
Other income, net of expenses 153 27 349 50
Interest charges 2,241 2,114 4,532 4,265
Income Before Income Taxes 8,367 5,689 26,345 28,400
Income tax expense 3,307 2,169 10,558 11,133
Net Income $ 5,060 $ 3,520 $ 15,787 $ 17,267
Weighted-Average Common Shares Outstanding:        
Basic 9,586,159 9,557,707 9,578,715 9,546,606
Diluted 9,681,597 9,650,887 9,674,240 9,642,374
Earnings Per Share of Common Stock:        
Basic $ 0.53 $ 0.37 $ 1.65 $ 1.81
Diluted $ 0.52 $ 0.37 $ 1.63 $ 1.79
Cash Dividends Declared Per Share of Common Stock $ 0.365 $ 0.345 $ 0.710 $ 0.675