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Quarterly Operating Results - Unaudited (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Operating Results - Unaudited [Abstract]
Operating Revenues	$ 28,107us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 32,669us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 29,190us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 27,173us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 27,421us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 31,285us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 29,102us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 27,038us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 117,139us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 114,846us-gaap_RegulatedAndUnregulatedOperatingRevenue	$ 110,379us-gaap_RegulatedAndUnregulatedOperatingRevenue
Operating Income	8,058us-gaap_OperatingIncomeLoss	11,620us-gaap_OperatingIncomeLoss	8,747us-gaap_OperatingIncomeLoss	5,967us-gaap_OperatingIncomeLoss	6,664us-gaap_OperatingIncomeLoss	10,270us-gaap_OperatingIncomeLoss	8,171us-gaap_OperatingIncomeLoss	5,865us-gaap_OperatingIncomeLoss	34,392us-gaap_OperatingIncomeLoss	30,970us-gaap_OperatingIncomeLoss	27,647us-gaap_OperatingIncomeLoss
Net Income	$ 3,790us-gaap_NetIncomeLoss	$ 6,758us-gaap_NetIncomeLoss	$ 4,728us-gaap_NetIncomeLoss	$ 3,169us-gaap_NetIncomeLoss	$ 3,168us-gaap_NetIncomeLoss	$ 5,807us-gaap_NetIncomeLoss	$ 4,481us-gaap_NetIncomeLoss	$ 3,177us-gaap_NetIncomeLoss	$ 18,445us-gaap_NetIncomeLoss	$ 16,633us-gaap_NetIncomeLoss	$ 14,396us-gaap_NetIncomeLoss
Basic	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.42us-gaap_EarningsPerShareBasic	$ 0.29us-gaap_EarningsPerShareBasic	$ 0.20us-gaap_EarningsPerShareBasic	$ 0.20us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ 0.28us-gaap_EarningsPerShareBasic	$ 0.20us-gaap_EarningsPerShareBasic	$ 1.14us-gaap_EarningsPerShareBasic	$ 1.04us-gaap_EarningsPerShareBasic	$ 0.90us-gaap_EarningsPerShareBasic
Diluted	$ 0.22us-gaap_EarningsPerShareDiluted	$ 0.42us-gaap_EarningsPerShareDiluted	$ 0.29us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted	$ 0.19us-gaap_EarningsPerShareDiluted	$ 0.36us-gaap_EarningsPerShareDiluted	$ 0.28us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted	$ 1.13us-gaap_EarningsPerShareDiluted	$ 1.03us-gaap_EarningsPerShareDiluted	$ 0.90us-gaap_EarningsPerShareDiluted

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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