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Quarterly Operating Results - Unaudited (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Operating Revenues	$ 31,456	$ 36,174	$ 33,014	$ 30,131	$ 31,808	$ 37,754	$ 32,725	$ 30,579	$ 130,775	$ 132,906	$ 126,025
Operating Income	8,471	12,806	9,563	7,780	7,846	14,156	10,328	8,302	38,620	40,632	35,840
Net Income	$ 5,345	$ 7,642	$ 5,381	$ 4,441	$ 3,220	$ 8,813	$ 5,919	$ 4,790	$ 22,809	$ 22,742	$ 20,028
Basic Earnings per Share	$ 0.32	$ 0.47	$ 0.33	$ 0.27	$ 0.20	$ 0.54	$ 0.36	$ 0.29	$ 1.39	$ 1.39	$ 1.23
Diluted Earnings per Share	$ 0.32	$ 0.46	$ 0.33	$ 0.27	$ 0.19	$ 0.54	$ 0.36	$ 0.29	$ 1.38	$ 1.38	$ 1.22

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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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