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Property, Plant and Equipment - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017	Dec. 31, 2016	May 31, 2015
Predecessor
Property, Plant and Equipment [Line Items]
Full cost ceiling limitation impairment		$ 298,000,000.0		$ 657,400,000
Predecessor | Drilling Carry Costs | Repsol E and P USA, Inc.
Property, Plant and Equipment [Line Items]
Drilling and completion costs carried							$ 31,000,000.0
Successor
Property, Plant and Equipment [Line Items]
Full cost ceiling limitation impairment	$ 0		$ 0
Successor | Repsol E and P USA, Inc.
Property, Plant and Equipment [Line Items]
Settlement of carry commitment						$ 1,200,000
Drilling And Oilfield Services Assets | Successor
Property, Plant and Equipment [Line Items]
Net realizable value of assets held for sale					$ 4,400,000
Held-for-sale | Drilling And Oilfield Services Assets | Predecessor
Property, Plant and Equipment [Line Items]
Loss on Disposition of Property Plant Equipment		$ 100,000		1,700,000
Held-for-sale | Drilling And Oilfield Services Assets | Successor
Property, Plant and Equipment [Line Items]
Impairment of assets to be disposed of	$ 500,000		3,500,000
Disposed of by Sale | Drilling And Oilfield Services Assets | Successor
Property, Plant and Equipment [Line Items]
Long-lived assets disposed of			$ 800,000
Electric Transmission System | Predecessor
Property, Plant and Equipment [Line Items]
Impairment of assets to be held-for-use				55,600,000
Midstream Services Equipment | Predecessor
Property, Plant and Equipment [Line Items]
Impairment of assets to be held-for-use				$ 1,700,000

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