Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating Revenues
Regulated energy	$ 72,296	$ 84,870
Unregulated energy	44,887	58,750
Other	3,731	2,977
Total operating revenues	120,914	146,597
Operating Expenses
Regulated energy cost of sales	35,672	47,990
Unregulated energy and other cost of sales	34,593	44,289
Operations	19,955	19,837
Maintenance	1,976	1,702
Depreciation and amortization	5,761	5,021
Other taxes	2,884	2,919
Total operating expenses	100,841	121,758
Operating Income	20,073	24,839
Other income, net of other expenses	196	22
Interest charges	2,291	2,150
Income Before Income Taxes	17,978	22,711
Income tax expense	7,251	8,964
Net Income	$ 10,727	$ 13,747
Weighted-Average Common Shares Outstanding:
Basic	9,571,270	9,535,381
Diluted	9,666,885	9,633,796
Earnings Per Share of Common Stock:
Basic	$ 1.12	$ 1.44
Diluted	$ 1.11	$ 1.43
Cash Dividends Declared Per Share of Common Stock	$ 0.345	$ 0.330