XML 46 R35.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Derivatives And Fair Value (Narrative) (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 USD ($) $ / Boe bbl | Dec. 31, 2016 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Volume | bbl | 180,000 |
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Underlying, Derivative Energy Measure | $ / Boe | 50.00 |
Prepayments and other [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative instruments | $ | $ 61 | $ 1,227

X
- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
Name: | us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix: | us-gaap_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | duration

X
- Definition Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract measured in energy volume but not the derivative contract itself. + References No definition available. + Details
Name: | us-gaap_UnderlyingDerivativeEnergyMeasure
Namespace Prefix: | us-gaap_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CommodityContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=egy_PrepaymentsAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |