Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Revenues
Regulated Energy	$ 246,208	$ 256,226	$ 269,438
Unregulated Energy	133,049	149,586	146,793
Other	13,245	12,215	11,315
Total operating revenues	392,502	418,027	427,546
Operating Expenses
Regulated energy cost of sales	111,402	128,111	145,207
Unregulated energy and other cost of sales	101,957	118,787	116,098
Operations	82,387	79,810	77,227
Maintenance	7,423	7,449	7,484
Depreciation and amortization	22,510	20,153	18,536
Other taxes	10,188	10,012	11,064
Total operating expenses	335,867	364,322	375,616
Operating Income	56,635	53,705	51,930
Other income, net of other expenses	271	906	195
Interest charges	8,747	9,000	9,146
Income Before Income Taxes	48,159	45,611	42,979
Income taxes	19,296	17,989	16,923
Net Income	$ 28,863	$ 27,622	$ 26,056
Weighted Average Common Shares Outstanding:
Basic	9,586,144	9,555,799	9,474,554
Diluted	9,671,507	9,651,058	9,582,374
Earnings Per Share of Common Stock:
Basic	$ 3.01	$ 2.89	$ 2.75
Diluted	$ 2.99	$ 2.87	$ 2.73
Cash Dividends Declared Per Share of Common Stock	$ 1.440	$ 1.365	$ 1.305