Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Derivative Instruments (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive income	$ 3,554	$ 879	$ 3,554	$ 879	$ 5,420	$ (3,654)	$ (1,096)
Realization of gain, net of taxes			3,600
Gas hedges
Derivatives, Fair Value [Line Items]
Gain or loss recognized in oil and gas contracts	3,603	337	10,108	(4,802)
Oil hedges
Derivatives, Fair Value [Line Items]
Gain or loss recognized in oil and gas contracts	299	(125)	38	(1,231)
Ngl hedges
Derivatives, Fair Value [Line Items]
Gain or loss recognized in oil and gas contracts	$ 191	$ 28	$ 348	$ 28