Fair Value of Derivative and Balance Sheet Location (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Derivatives, Fair Value
Derivative Asset, Fair Value, Gross Asset	$ 27,521	$ 11,177
Derivative Liability, Fair Value, Gross Liability	33,248	81,190
Current Assets
Derivatives, Fair Value
Fair Value of Derivatives	3,874	301
Derivative Asset, Fair Value, Gross Asset	22,916	8,791
Non Current Assets
Derivatives, Fair Value
Fair Value of Derivatives	663	1,263
Derivative Asset, Fair Value, Gross Asset	4,605	2,386
Current Liabilities
Derivatives, Fair Value
Fair Value of Derivatives	92	30
Derivative Liability, Fair Value, Gross Liability	25,987	53,595
Non Current Liabilities
Derivatives, Fair Value
Derivative Liability, Fair Value, Gross Liability	7,261	27,595
Commodity Contracts Related to Natural Gas and Crude Oil Sales \| Current Assets
Derivatives, Fair Value
Fair Value of Derivatives	19,042	8,490
Commodity Contracts Related to Natural Gas and Crude Oil Sales \| Non Current Assets
Derivatives, Fair Value
Fair Value of Derivatives	3,942	1,123
Commodity Contracts Related to Natural Gas and Crude Oil Sales \| Current Liabilities
Derivatives, Fair Value
Fair Value of Derivatives	25,895	53,565
Commodity Contracts Related to Natural Gas and Crude Oil Sales \| Non Current Liabilities
Derivatives, Fair Value
Derivative Liability, Fair Value, Gross Liability	$ 7,244	$ 27,595

Fair value, before 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 elected not to be offset. Excludes assets not subject to a master netting arrangement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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No definition available.

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