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Derivative Commodity Instruments - Quantitative Disclosures About Fair Value (Details) (USD $) In Thousands, unless otherwise specified				3 Months Ended				3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Discounted Cash Flow Level 3 Natural Gas Basis - San Juan 2014	Mar. 31, 2014 Discounted Cash Flow Level 3 Natural Gas Basis - San Juan 2014 Minimum	Mar. 31, 2014 Discounted Cash Flow Level 3 Natural Gas Basis - San Juan 2014 Maximum	Mar. 31, 2014 Discounted Cash Flow Level 3 Natural Gas Basis - San Juan 2015	Mar. 31, 2014 Discounted Cash Flow Level 3 Natural Gas Basis - Permian 2014	Mar. 31, 2014 Discounted Cash Flow Level 3 Natural Gas Basis - Permian 2014 Minimum	Mar. 31, 2014 Discounted Cash Flow Level 3 Natural Gas Basis - Permian 2014 Maximum
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Fair Value as of March 31, 2014	$ 5,995	$ 22,902	$ 5,326			$ (129)	$ (3,819)
Fair Value as of March 31, 2014	$ (53,404)	$ (30,302)
Fair Value Inputs, Price Per Cubic Foot				0.06	0.09	0.14		0.12	0.13

Fair value, after the effects of master netting arrangements, of a financial asset or other 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 assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

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 assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details