XML 65 R48.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Debt (Narrative) (Details) $ in Millions |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2017 | Jun. 29, 2016 USD ($) | Dec. 31, 2016 USD ($) | Mar. 13, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 28, 2016 | Dec. 31, 2015 USD ($) | Jan. 31, 2014 USD ($)
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facility borrowing base |  | $ 20.0 |  |  | $ 20.0 |  | $ 20.1 |
Debt instrument, commitment fee |  |  | 2.30% |  |  |  |  |
Line Of Credit Facility Maximum Borrowing Capacity |  |  |  |  |  |  |  | $ 65.0
Ratio of net debt to EBITDAX |  |  | 5.0 |  |  |  |  |
Debt service coverage ratio minimum at each quarter |  |  | 1.2 |  |  |  |  |
Senior Tranche [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument, commitment fee |  |  |  |  |  | 1.50% |  |
Line Of Credit Facility Maximum Borrowing Capacity |  | 50.0 |  |  |  |  |  |
Subordinated Tranche [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument, commitment fee |  |  |  |  |  | 2.30% |  |
Line Of Credit Facility Maximum Borrowing Capacity |  | 15.0 |  |  |  |  |  |
Additional Term Loan [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facility borrowing base |  | $ 5.0 |  |  |  |  |  |
Additional Term Loan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Loans Payable |  |  |  | $ 0.0 |  |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument interest rate spread |  | 5.75% |  |  |  |  |  |
Loans Payable |  | $ 15.0 | $ 15.0 |  |  |  |  |
Term loan fair value |  |  | $ 15.0 |  |  |  |  |
Loan Agreements, January 1, 2017 to Maturity [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Ratio of net debt to EBITDAX | 3.0 |  |  |  |  |  |  |

X
- Definition Debt instrument commitment fee. + References No definition available. + Details
Name: | egy_DebtInstrumentCommitmentFee
Namespace Prefix: | egy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Service Coverage Ratio Maximum At Each Quarter + References No definition available. + Details
Name: | egy_DebtServiceCoverageRatioMinimumAtEachQuarter
Namespace Prefix: | egy_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Ratio Of Net Debt To EBITDAX + References No definition available. + Details
Name: | egy_RatioOfNetDebtToEbitdax
Namespace Prefix: | egy_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
Name: | us-gaap_LoansPayable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value portion of contractual obligation to pay money on demand or on fixed or determinable dates. + References No definition available. + Details
Name: | us-gaap_LoansPayableFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SubordinatedDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=egy_AdditionalTermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=egy_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=egy_LoanAgreementsJanuary12017ToMaturityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |