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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, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Operating Results - Unaudited Details
Operating Revenues	$ 27,421	$ 31,285	$ 29,102	$ 27,038	$ 27,079	$ 32,353	$ 27,401	$ 23,546	$ 114,846	$ 110,379	$ 102,069
Operating Income	6,664	10,270	8,171	5,865	5,717	10,843	7,210	3,877	30,970	27,647	24,201
Net Income	$ 3,168	$ 5,807	$ 4,481	$ 3,177	$ 2,726	$ 6,138	$ 3,725	$ 1,807	$ 16,633	$ 14,396	$ 13,447
Basic	$ 0.2	$ 0.36	$ 0.28	$ 0.2	$ 0.17	$ 0.39	$ 0.23	$ 0.11	$ 1.04	$ 0.90	$ 0.85
Diluted	$ 0.19	$ 0.36	$ 0.28	$ 0.2	$ 0.17	$ 0.39	$ 0.23	$ 0.11	$ 1.03	$ 0.90	$ 0.84

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