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Quarterly Data - Unaudited (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Operating Revenues	$ 33,268	$ 38,713	$ 34,919	$ 31,177	$ 31,456	$ 36,174	$ 33,014	$ 30,131	$ 138,077	$ 130,775	$ 132,906
Operating Income	7,153	12,918	10,721	6,350	8,264	12,601	9,358	7,575	37,142	37,798	40,302
Net Income	$ 6,993	$ 12,290	$ 8,675	$ 4,494	$ 5,345	$ 7,642	$ 5,381	$ 4,441	$ 32,452	$ 22,809	$ 22,742
Basic Earnings per Share	$ 0.43	$ 0.75	$ 0.52	$ 0.27	$ 0.32	$ 0.47	$ 0.33	$ 0.27	$ 1.97	$ 1.39	$ 1.39
Diluted Earnings per Share	0.43	0.74	0.52	0.27	0.32	0.46	0.33	0.27	1.96	1.38	1.38
Common divident per share	0.2400	0.2238	0.2238	0.2238	0.2238	0.2113	0.2113	0.2113	$ 0.911	$ 0.858	$ 0.808
High common stock price	60.31	49.00	45.24	41.45	46.74	40.87	41.50	42.80
Low common stock price	$ 43.12	$ 41.77	$ 34.74	$ 33.96	$ 39.10	$ 36.99	$ 32.23	$ 34.55

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