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Quarterly Operating Results - Unaudited (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Operating Results - Unaudited [Abstract]
Operating Revenues	$ 30,925	$ 34,654	$ 31,666	$ 28,780	$ 28,107	$ 32,669	$ 29,190	$ 27,173	$ 126,025	$ 117,139	$ 114,846
Operating Income	8,460	11,460	9,235	6,685	8,058	11,620	8,747	5,967	35,840	34,392	30,970
Net Income	$ 4,560	$ 6,743	$ 5,089	$ 3,636	$ 3,790	$ 6,758	$ 4,728	$ 3,169	$ 20,028	$ 18,445	$ 16,633
Basic Earnings per Share	$ 0.29	$ 0.41	$ 0.31	$ 0.22	$ 0.23	$ 0.42	$ 0.29	$ 0.20	$ 1.23	$ 1.14	$ 1.04
Diluted Earnings per Share	$ 0.28	$ 0.41	$ 0.31	$ 0.22	$ 0.22	$ 0.42	$ 0.29	$ 0.20	$ 1.22	$ 1.13	$ 1.03

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

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.