XML 96 R64.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Impairment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Oct. 01, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Successor |  |  |  |
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items] |  |  |  |
Full cost pool ceiling impairments | $ 319,087 |  | $ 0 | $ 0
Asset impairment charges | $ 319,087 |  | 4,170 | 4,019
Successor | Drilling assets |  |  |  |
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items] |  |  |  |
Asset impairment charges |  |  | 22 | 4,019
Successor | Electrical infrastructure assets |  |  |  |
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items] |  |  |  |
Asset impairment charges |  |  | 0 | 0
Successor | Midstream assets |  |  |  |
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items] |  |  |  |
Asset impairment charges |  |  | $ 4,148 | $ 0
Predecessor |  |  |  |
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items] |  |  |  |
Full cost pool ceiling impairments |  | $ 657,392 |  |
Asset impairment charges |  | 718,194 |  |
Predecessor | Drilling assets |  |  |  |
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items] |  |  |  |
Asset impairment charges |  | 3,511 |  |
Predecessor | Electrical infrastructure assets |  |  |  |
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items] |  |  |  |
Asset impairment charges |  | 55,600 |  |
Predecessor | Midstream assets |  |  |  |
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items] |  |  |  |
Asset impairment charges |  | $ 1,691 |  |

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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
Name: | us-gaap_UnamortizedCostsCapitalizedLessRelatedDeferredIncomeTaxesExceedCeilingLimitationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition [Line Items] for Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Table] + References No definition available. + Details
Name: | wfx_ScheduleofImpairedLongLivedAssetsHeldandUsedandIntangibleAssetsLineItems
Namespace Prefix: | wfx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_SuccessorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=wfx_DrillingAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ElectricTransmissionAndDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=wfx_MidstreamAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_PredecessorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |