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Equity Method Investment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Equity Method Investment (Textual)
Ownership interest percentage in crawford county gas gathering company, LLC	50.00%		50.00%
Equity investment income (loss) in crawford county gas gathering company, LLC	$ (74)	$ 26	$ (79)	$ 27

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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