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Supplemental Information on Oil and Natural Gas Producing Activities (Unaudited) - Narrative (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2016 MBoe	Oct. 01, 2016 MBoe	Dec. 31, 2018 MBoe	Dec. 31, 2017 MBoe	Dec. 31, 2016 MBoe well	Dec. 31, 2015 MBoe
Reserve Quantities [Line Items]
Percentage of proved reserves estimates prepared by external engineers			0.90
Proved developed and undeveloped reserves (MBoe)			160,200	177,600
Revision of previous estimates (MBoe)			(24,900)	10,900	(105,400)
Revision of previous estimates due to changes in well performance (MBoe)			(8,300)		(94,700)
Proved Developed and Undeveloped Reserves, Sale of Mineral in Place (Energy)			6,600	1,900	24,600
Acquisitions of new reserves (MBoe)			15,400
Upward revision of estimates due to extensions (MBoe)			19,300	19,400	7,800
Revision of previous estimates due to changes in commodity pricing (MBoe)					(12,100)
Decrease in reserves due to changes in accounting					(19,100)
Natural Gas and LNG
Reserve Quantities [Line Items]
Percent share of downward revision					(85.00%)
Oil
Reserve Quantities [Line Items]
Percent share of downward revision					(15.00%)
Mid-Continent
Reserve Quantities [Line Items]
Minimum number of wells in areas with decline in production | well					3
Number of years wells in production seeing decline in production					2 years
Successor
Reserve Quantities [Line Items]
Proved developed and undeveloped reserves (MBoe)	163,955		160,176	177,594	163,955
Revision of previous estimates (MBoe)	25,270		(33,188)	10,879
Proved Developed and Undeveloped Reserves, Sale of Mineral in Place (Energy)			6,577	1,909
Acquisitions of new reserves (MBoe)			15,350	202
Upward revision of estimates due to extensions (MBoe)	5,034		19,332	19,373
Predecessor
Reserve Quantities [Line Items]
Proved developed and undeveloped reserves (MBoe)		137,992				324,626
Revision of previous estimates (MBoe)		(130,709)
Proved Developed and Undeveloped Reserves, Sale of Mineral in Place (Energy)		24,598
Upward revision of estimates due to extensions (MBoe)		2,785

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- Definition

Energy measure of increase in quantity of proved reserve of oil and gas resulting from the extension of the proved acreage of previously discovered reservoir or discovery of new field with proved reserve or of new reservoir of proved reserve in old field, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 235
-Section 50
-Paragraph 5
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Energy measure of proved reserve of oil and gas, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Energy measure of increase in quantity of proved reserve of oil and gas resulting from purchase of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
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-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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