Condensed Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Operating Revenues
Regulated energy	$ 55,216	$ 55,553	$ 136,783	$ 127,849
Unregulated energy	36,025	25,176	91,016	70,063
Other	2,905	3,168	7,075	6,899
Total Operating Revenues	94,146	83,897	234,874	204,811
Operating Expenses
Regulated energy cost of sales	22,115	23,433	63,730	59,105
Unregulated energy and other cost of sales	28,773	19,861	68,861	54,453
Operations	22,822	20,071	44,577	40,027
Maintenance	1,820	1,858	3,542	3,834
Depreciation and amortization	5,977	5,885	11,797	11,646
Other taxes	3,487	2,334	6,665	5,218
Total Operating Expenses	84,994	73,442	199,172	174,283
Operating Income	9,152	10,455	35,702	30,528
Other income, net of other expenses	24	153	312	349
Interest charges	2,016	2,241	4,088	4,532
Income Before Income Taxes	7,160	8,367	31,926	26,345
Income taxes	2,804	3,307	12,701	10,558
Net Income	$ 4,356	$ 5,060	$ 19,225	$ 15,787
Weighted Average Common Shares Outstanding:
Basic (in shares)	9,621,580	9,586,159	9,611,610	9,578,715
Diluted (in shares)	9,695,470	9,681,597	9,687,253	9,674,240
Earnings Per Share of Common Stock:
Basic (in usd per share)	$ 0.45	$ 0.53	$ 2.00	$ 1.65
Diluted (in usd per share)	$ 0.45	$ 0.52	$ 1.99	$ 1.63
Cash Dividends Declared Per Share of Common Stock (in usd per share)	$ 0.385	$ 0.365	$ 0.75	$ 0.71