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Derivatives - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) institution	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) institution	Sep. 30, 2016 USD ($)
Successor
Derivative Instruments and Hedging Activities Disclosure
Loss (gain) on derivative contracts	$ 11,702		$ (46,024)
Cash receipts, upon settlement of derivative contract			$ 7,700
Number of counterparties to open derivative contracts | institution	7		7
Successor | Commodity Derivatives
Derivative Instruments and Hedging Activities Disclosure
Loss (gain) on derivative contracts	$ 11,700		$ (46,000)
Cash receipts, upon settlement of derivative contract	$ 5,000		$ 7,700
Predecessor
Derivative Instruments and Hedging Activities Disclosure
Loss (gain) on derivative contracts		$ (338)		$ 4,823
Cash receipts, upon settlement of derivative contract				72,608
Predecessor | Commodity Derivatives
Derivative Instruments and Hedging Activities Disclosure
Loss (gain) on derivative contracts		(300)		4,800
Cash receipts, upon settlement of derivative contract		14,600		$ 72,600
Cash receipts, upon early settlement of derivative contract		$ 17,900

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Derivative, Cash Received on Early Settlement

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- Definition

Derivative Instruments and Hedging Activities Disclosure [Line Items]

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- Definition

Number Of Counterparties To Open Derivative Contracts

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- Definition

The net cash outflow or inflow from derivatives instruments during the period, which are classified as operating activities, excluding those designated as hedging instruments.

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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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