Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Successor - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring Basis
Derivative assets	$ 5,582
Derivative Liabilities	18,467	$ 29,714
Recurring Measurement Basis
Fair Value Assets And Liabilities Measured On Recurring Basis
Investments	5,072	7,541
Assets	6,382	7,541
Derivative Assets, Netting	(4,272)
Derivative Liabilities, Netting	(4,272)	0
Derivative Liabilities at Fair Value	14,195	29,714
Recurring Measurement Basis \| Commodity derivative contracts
Fair Value Assets And Liabilities Measured On Recurring Basis
Derivative Assets, Netting	(4,272)
Derivative Assets at Fair Value	1,310
Derivative Liabilities, Netting	(4,272)	0
Derivative Liabilities at Fair Value	14,195	29,714
Recurring Measurement Basis \| Level 1
Fair Value Assets And Liabilities Measured On Recurring Basis
Investments	5,072	7,541
Assets	5,072	7,541
Derivative Liabilities	0	0
Recurring Measurement Basis \| Level 1 \| Commodity derivative contracts
Fair Value Assets And Liabilities Measured On Recurring Basis
Derivative assets	0
Derivative Liabilities	0	0
Recurring Measurement Basis \| Level 2
Fair Value Assets And Liabilities Measured On Recurring Basis
Investments	0	0
Assets	5,582	0
Derivative Liabilities	18,467	29,714
Recurring Measurement Basis \| Level 2 \| Commodity derivative contracts
Fair Value Assets And Liabilities Measured On Recurring Basis
Derivative assets	5,582
Derivative Liabilities	18,467	29,714
Recurring Measurement Basis \| Level 3
Fair Value Assets And Liabilities Measured On Recurring Basis
Investments	0	0
Assets	0	0
Derivative Liabilities	0	0
Recurring Measurement Basis \| Level 3 \| Commodity derivative contracts
Fair Value Assets And Liabilities Measured On Recurring Basis
Derivative assets	0
Derivative Liabilities	$ 0	$ 0

Deferred Compensation Plan, Fair Value of Plan Assets

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Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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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 not subject to a master netting arrangement and elected not to be offset.

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Fair value of liability associated with 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, and obligation to return cash collateral under master netting arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 50
-Paragraph 3
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 55
-Paragraph 8
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
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Fair value, before effects of master netting arrangements, of a financial liability or 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 liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
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-Subparagraph (c)(2)
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Fair value of asset associated with financial liability or 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, and right to receive cash collateral under master netting arrangements.

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