Fair Value of Derivative and Balance Sheet Location (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value
Derivative Asset, Fair Value, Gross Asset	$ 111,584	$ 266,046
Derivative Liability, Fair Value, Gross Liability	49,654	2,290
Current Assets
Derivatives, Fair Value
Derivative Asset, Fair Value, Gross Asset	98,839	221,659
Non Current Assets
Derivatives, Fair Value
Derivative Asset, Fair Value, Gross Asset	12,745	44,387
Current Liabilities
Derivatives, Fair Value
Derivative Liability, Fair Value, Gross Liability	22,824	1,595
Non Current Liabilities
Derivatives, Fair Value
Derivative Liability, Fair Value, Gross Liability	26,830	695
Commodity Contracts Related to Natural Gas and Crude Oil Sales \| Current Assets
Derivatives, Fair Value
Fair Value of Derivatives	98,526	221,161
Commodity Contracts Related to Natural Gas and Crude Oil Sales \| Non Current Assets
Derivatives, Fair Value
Fair Value of Derivatives	12,673	44,292
Commodity Contracts Related to Natural Gas and Crude Oil Sales \| Current Liabilities
Derivatives, Fair Value
Fair Value of Derivatives	21,179	0
Commodity Contracts Related to Natural Gas and Crude Oil Sales \| Non Current Liabilities
Derivatives, Fair Value
Fair Value of Derivatives	26,509	275
Commodity Contracts Related to Natural Gas Marketing \| Current Assets
Derivatives, Fair Value
Fair Value of Derivatives	313	441
Commodity Contracts Related to Natural Gas Marketing \| Non Current Assets
Derivatives, Fair Value
Fair Value of Derivatives	72	51
Commodity Contracts Related to Natural Gas Marketing \| Current Liabilities
Derivatives, Fair Value
Fair Value of Derivatives	251	417
Commodity Contracts Related to Natural Gas Marketing \| Non Current Liabilities
Derivatives, Fair Value
Fair Value of Derivatives	54	46
Basis Protection Contracts Related to Natural Gas and Crude Oil Sales \| Current Assets
Derivatives, Fair Value
Fair Value of Derivatives	0	57
Basis Protection Contracts Related to Natural Gas and Crude Oil Sales \| Non Current Assets
Derivatives, Fair Value
Fair Value of Derivatives	0	44
Basis Protection Contracts Related to Natural Gas and Crude Oil Sales \| Current Liabilities
Derivatives, Fair Value
Fair Value of Derivatives	1,394	1,178
Basis Protection Contracts Related to Natural Gas and Crude Oil Sales \| Non Current Liabilities
Derivatives, Fair Value
Fair Value of Derivatives	$ 267	$ 374

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
-Paragraph 3
-Subparagraph (a)
-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
-Topic 815
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
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- Definition

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+ References

No definition available.

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