Commodity Derivative Instruments (Details 4) - Commodity Derivative Instruments - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Liabilities
Gross Amounts of Recognized Liabilities	$ (751)	$ (100)
Gross Amounts Offset in the Balance Sheet	731	72
Net Amounts of Liabilities Presented in the Balance Sheet	(20)	(28)
Net Amount	$ (20)	$ (28)

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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