Condensed Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Operating Revenues
Regulated energy	$ 55,680	$ 52,196	$ 192,463	$ 180,045
Unregulated energy	28,262	23,259	119,278	93,323
Other	2,603	2,720	9,678	9,619
Total Operating Revenues	86,545	78,175	321,419	282,987
Operating Expenses
Regulated energy cost of sales	22,591	22,102	86,321	81,207
Unregulated energy and other cost of sales	21,795	17,602	90,656	72,056
Operations	21,300	20,804	65,878	60,831
Maintenance	2,146	1,801	5,688	5,635
Depreciation and amortization	6,274	5,767	18,071	17,413
Other taxes	3,719	2,535	10,383	7,753
Total Operating Expenses	77,825	70,611	276,997	244,895
Operating Income	8,720	7,564	44,422	38,092
Other income, net of other expenses	101	(136)	413	212
Interest charges	2,026	2,126	6,114	6,657
Income Before Income Taxes	6,795	5,302	38,721	31,647
Income taxes	2,916	2,083	15,617	12,641
Net Income	$ 3,879	$ 3,219	$ 23,104	$ 19,006
Weighted Average Common Shares Outstanding:
Basic (in shares)	9,625,435	9,592,417	9,616,269	9,583,316
Diluted (in shares)	9,702,334	9,676,658	9,692,311	9,673,681
Earnings Per Share of Common Stock:
Basic (in usd per share)	$ 0.40	$ 0.34	$ 2.40	$ 1.98
Diluted (in usd per share)	$ 0.40	$ 0.33	$ 2.39	$ 1.97
Cash Dividends Declared Per Share of Common Stock (in usd per share)	$ 0.385	$ 0.365	$ 1.135	$ 1.08