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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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- Definition The excess of unamortized costs capitalized within a cost center, less related deferred income taxes, over the cost center ceiling limitation, which is charged to expense for oil and gas producing companies that use full cost method of accounting for investments in oil and gas producing properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(4)(ii)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27015634&loc=d3e516453-122869 + Details
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