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Property, Plant and Equipment - Narrative (Details)	3 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($)	Dec. 31, 2016 $ / Boe	Oct. 01, 2016 $ / Boe	Dec. 31, 2018 USD ($) $ / Boe	Dec. 31, 2017 USD ($) $ / Boe	Mar. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items]
Assets held for sale					$ 10,600,000
Proceeds from sale of property held-for-sale	$ 10,400,000
Gain (loss) on sale of assets and asset impairment charges	$ 0			$ 1,100,000
Assets held-for-sale, current, other						$ 5,700,000
NRV of assets held-for-sale						$ 1,600,000
Impairment recognized				$ 4,100,000
Expected completion of evaluation activities on majority of unproved properties				10 years
Minimum
Property, Plant and Equipment [Line Items]
Expect completion of evaluation activities on majority of unproved properties, without existing production				3 years
Maximum
Property, Plant and Equipment [Line Items]
Expect completion of evaluation activities on majority of unproved properties, without existing production				5 years
Property Located in Oklahoma City, OK
Property, Plant and Equipment [Line Items]
Assets held for sale					$ 9,300,000
Successor
Property, Plant and Equipment [Line Items]
Average depreciation and depletion rate (usd per Boe) | $ / Boe		8.31		10.32	7.92
Predecessor
Property, Plant and Equipment [Line Items]
Average depreciation and depletion rate (usd per Boe) | $ / Boe			6.05

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Fair value portion of assets classified as held for sale.

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Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

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