DERIVATIVE FINANCIAL INSTRUMENTS Fair Value of Derivative and Balance Sheet Location (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 81,190	$ 2,290
Derivative Asset, Fair Value, Gross Asset	11,177	266,046
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	8,791	221,659
Non Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	2,386	44,387
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	53,595	1,595
Non Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	27,595	695
Commodity Contracts Related to Natural Gas and Crude Oil Sales [Member] \| Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives	8,239	221,161
Commodity Contracts Related to Natural Gas and Crude Oil Sales [Member] \| Non Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives	1,104	44,292
Commodity Contracts Related to Natural Gas and Crude Oil Sales [Member] \| Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives	53,353	0
Commodity Contracts Related to Natural Gas and Crude Oil Sales [Member] \| Non Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives	27,581	275
Commodity Contracts Related to Natural Gas Marketing [Member] \| Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives	251	441
Commodity Contracts Related to Natural Gas Marketing [Member] \| Non Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives	19	51
Commodity Contracts Related to Natural Gas Marketing [Member] \| Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives	212	417
Commodity Contracts Related to Natural Gas Marketing [Member] \| Non Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives	14	46
Basis Protection Contracts Related to Natural Gas and Crude Oil Sales [Member] \| Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives	301	57
Basis Protection Contracts Related to Natural Gas and Crude Oil Sales [Member] \| Non Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives	1,263	44
Basis Protection Contracts Related to Natural Gas and Crude Oil Sales [Member] \| Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives	30	1,178
Basis Protection Contracts Related to Natural Gas and Crude Oil Sales [Member] \| Non Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives	$ 0	$ 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
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959

Reference 3: 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

Reference 4: 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=64830801&loc=SL51823488-111719

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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=64830801&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
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=64837297&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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- Definition

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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
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959

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- Definition

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+ References

No definition available.

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