Fair Value of Derivative and Balance Sheet Location (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value
Derivative Asset, Fair Value, Gross Asset	$ 28,610	$ 14,338
Derivative Liability, Fair Value, Gross Liability	137,109	101,645
Current Assets
Derivatives, Fair Value
Fair Value of Derivatives	22,652	6,998
Derivative Asset, Fair Value, Gross Asset	28,610	14,338
Non Current Assets
Derivatives, Fair Value
Derivative Asset, Fair Value, Gross Asset	0	0
Current Liabilities
Derivatives, Fair Value
Fair Value of Derivatives	122	234
Derivative Liability, Fair Value, Gross Liability	110,683	79,302
Non Current Liabilities
Derivatives, Fair Value
Fair Value of Derivatives	(21)	0
Derivative Liability, Fair Value, Gross Liability	26,426	22,343
Rollfactor Derivative Contracts Related to Natural Gas and Crude Oil Sales [Member] [Member] \| Current Liabilities
Derivatives, Fair Value
Fair Value of Derivatives	1,798	1,069
Commodity Contracts Related to Natural Gas and Crude Oil Sales \| Current Assets
Derivatives, Fair Value
Fair Value of Derivatives	5,958	7,340
Commodity Contracts Related to Natural Gas and Crude Oil Sales \| Current Liabilities
Derivatives, Fair Value
Fair Value of Derivatives	108,763	77,999
Commodity Contracts Related to Natural Gas and Crude Oil Sales \| Non Current Liabilities
Derivatives, Fair Value
Derivative Liability, Fair Value, Gross Liability	$ 26,447	$ 22,343

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
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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
-Topic 815
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 3
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-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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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