Supplementary Information on Oil and Gas Operations—Unaudited - Average Price and Text (Details) Mcfe in Thousands, MMcf in Thousands, MBbls in Thousands	12 Months Ended
Dec. 31, 2018 Mcfe Wells $ / mcf $ / bbl $ / Mcfe MBbls MMcf	Dec. 31, 2017 Mcfe Wells $ / mcf $ / bbl $ / Mcfe MBbls MMcf	Dec. 31, 2016 Mcfe Wells $ / mcf $ / bbl $ / Mcfe MBbls MMcf
Reserve Quantities [Line Items]
Company drilling success rate	100.00%	100.00%	100.00%
Gross wells drilled \| Wells	2	8	5
Oil
Reserve Quantities [Line Items]
Number of Bcfe additions \| MBbls	41	777	0
Consolidated oil and gas production costs per unit of production \| $ / bbl	68.71	52.49	40.85
Mcfe of natural gas liquids
Reserve Quantities [Line Items]
Extensions, discoveries and other additions of Bcfe	2,929	4,565	0
Consolidated oil and gas production costs per unit of production \| $ / Mcfe	4.08	3.23	2.40
Oil and Natural Gas Reserves
Reserve Quantities [Line Items]
Increase in proved developed and undeveloped reserves	(16.00%)	35.04646%	(35.12449%)
Extensions, discoveries and other additions of Bcfe	11,121	73,931	1,485
Natural Gas
Reserve Quantities [Line Items]
Number of Bcfe additions \| MMcf	7,947	64,704	1,485
Consolidated oil and gas production costs per unit of production \| $ / mcf	3.13	3.03	1.82
Gulf of Mexico Properties \| Oil and Natural Gas Reserves
Reserve Quantities [Line Items]
Removal of Bcfe	10,148
Certain PUDs In East Texas \| Oil and Natural Gas Reserves
Reserve Quantities [Line Items]
Removal of Bcfe	7,324

Increase (Decrease) in Estimated Proved Reserves, Percent

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- Definition

Proved Developed and Undeveloped Reserves, Company Drilling Success Rate

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- Definition

Proved Developed and Undeveloped Reserves, Extensions, Discoveries and Additions, Equivalent

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Proved Developed and Undeveloped Reserves, Gross Wells Drilled

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Proved Developed and Undeveloped Reserves, Removal, Equivalent

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Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The average consolidated production costs (lifting costs) per unit of production. Costs may include costs incurred to operate and maintain wells and equipment and to pay production taxes.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1204
-Paragraph (b)
-Subparagraph (2)

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