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STATEMENTS OF CONSOLIDATED CASH FLOWS (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |
Net income (loss) | $ (77,550)us-gaap_ProfitLoss | $ 43,072 us-gaap_ProfitLoss | $ 5,339 us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Depreciation, depletion and amortization | 20,086 us-gaap_DepreciationDepletionAndAmortization | 16,929 us-gaap_DepreciationDepletionAndAmortization | 19,913 us-gaap_DepreciationDepletionAndAmortization
Amortization of debt issuance cost | 328 us-gaap_AmortizationOfFinancingCosts |  |
Unrealized foreign exchange (gain) loss | (59)us-gaap_ForeignCurrencyTransactionGainLossUnrealized | 22 us-gaap_ForeignCurrencyTransactionGainLossUnrealized | (245)us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Dry hole costs and impairment loss on unproved leasehold | 13,273 us-gaap_ExplorationAbandonmentAndImpairmentExpense | 22,490 us-gaap_ExplorationAbandonmentAndImpairmentExpense | 37,289 us-gaap_ExplorationAbandonmentAndImpairmentExpense
Stock based compensation | 3,322 us-gaap_ShareBasedCompensation | 3,005 us-gaap_ShareBasedCompensation | 2,406 us-gaap_ShareBasedCompensation
Bad debt provision | 2,400 us-gaap_ProvisionForDoubtfulAccounts | 1,562 us-gaap_ProvisionForDoubtfulAccounts | 1,621 us-gaap_ProvisionForDoubtfulAccounts
Impairment loss | 98,341 us-gaap_AssetImpairmentCharges |  | 7,620 us-gaap_AssetImpairmentCharges
Change in operating assets and liabilities: |  |  |
Trade receivables | (2,555)us-gaap_IncreaseDecreaseInAccountsReceivable | (9,011)us-gaap_IncreaseDecreaseInAccountsReceivable | 2,126 us-gaap_IncreaseDecreaseInAccountsReceivable
Accounts with partners | (13,864)us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties | (12,649)us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties | 18,988 us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties
Other receivables | (1,250)us-gaap_IncreaseDecreaseInOtherReceivables | (53)us-gaap_IncreaseDecreaseInOtherReceivables | (199)us-gaap_IncreaseDecreaseInOtherReceivables
Crude oil inventory | (1,748)us-gaap_IncreaseDecreaseInFuelInventories | 279 us-gaap_IncreaseDecreaseInFuelInventories | (71)us-gaap_IncreaseDecreaseInFuelInventories
Materials and supplies | (122)us-gaap_IncreaseDecreaseInRawMaterialsPackagingMaterialsAndSuppliesInventories | 173 us-gaap_IncreaseDecreaseInRawMaterialsPackagingMaterialsAndSuppliesInventories | (102)us-gaap_IncreaseDecreaseInRawMaterialsPackagingMaterialsAndSuppliesInventories
Other long term assets | (3,537)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets |  |
Prepayments and other | (4,172)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | 594 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | (766)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and other liabilities | (9,503)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities | 8,988 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities | 39 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Net cash provided by operating activities | 23,390 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 75,401 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 93,958 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |
Decrease/(increase) in restricted cash | (9,219)us-gaap_IncreaseDecreaseInRestrictedCash | (1,065)us-gaap_IncreaseDecreaseInRestrictedCash | 78 us-gaap_IncreaseDecreaseInRestrictedCash
Property and equipment expenditures | (92,179)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (66,879)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (71,915)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities | (101,398)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (67,944)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (71,837)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |
Proceeds from the issuance of common stock | 5,685 us-gaap_ProceedsFromIssuanceOfCommonStock | 3,729 us-gaap_ProceedsFromIssuanceOfCommonStock | 3,335 us-gaap_ProceedsFromIssuanceOfCommonStock
Debt issuance costs | (2,287)us-gaap_PaymentsOfDebtIssuanceCosts |  |
Borrowings | 15,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt |  |
Purchase of treasury stock | (1,868)us-gaap_PaymentsForRepurchaseOfCommonStock | (11,456)us-gaap_PaymentsForRepurchaseOfCommonStock |
Distribution to noncontrolling interest |  |  | (5,595)us-gaap_PaymentsOfDividendsMinorityInterest
Acquisition of noncontrolling interest |  |  | (26,200)us-gaap_PaymentsToMinorityShareholders
Net cash provided by (used in) financing activities | 16,530 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | (7,727)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | (28,460)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
NET CHANGE IN CASH AND CASH EQUIVALENTS | (61,478)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (270)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (6,339)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 130,529 us-gaap_CashAndCashEquivalentsAtCarryingValue | 130,800 us-gaap_CashAndCashEquivalentsAtCarryingValue | 137,139 us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 69,051 us-gaap_CashAndCashEquivalentsAtCarryingValue | 130,529 us-gaap_CashAndCashEquivalentsAtCarryingValue | 130,800 us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow information |  |  |
Cash paid for Income taxes | 23,041 us-gaap_IncomeTaxesPaid | 34,444 us-gaap_IncomeTaxesPaid | 83,306 us-gaap_IncomeTaxesPaid
Supplemental disclosure of non cash investing and financing activities |  |  |
Property and equipment additions incurred during the period but not paid at period end | 18,983 us-gaap_CapitalExpendituresIncurredButNotYetPaid | 13,440 us-gaap_CapitalExpendituresIncurredButNotYetPaid | 9,814 us-gaap_CapitalExpendituresIncurredButNotYetPaid
Receivable from employees for stock option exercise |  |  | $ 173 egy_ReceivableFromEmployeesForStockOptionExercise

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- Definition Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends provided by the non-wholly owned subsidiary to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity 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 -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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