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STATEMENTS OF CONSOLIDATED OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues: |  |  |
Oil and gas sales | $ 127,691 us-gaap_OilAndGasSalesRevenue | $ 169,277 us-gaap_OilAndGasSalesRevenue | $ 195,287 us-gaap_OilAndGasSalesRevenue
Operating costs and expenses: |  |  |
Production expense | 31,718 us-gaap_OilAndGasProductionExpense | 36,615 us-gaap_OilAndGasProductionExpense | 26,724 us-gaap_OilAndGasProductionExpense
Exploration expense | 15,358 us-gaap_ExplorationExpense | 23,928 us-gaap_ExplorationExpense | 41,037 us-gaap_ExplorationExpense
Depreciation, depletion and amortization | 20,086 us-gaap_DepreciationDepletionAndAmortization | 16,929 us-gaap_DepreciationDepletionAndAmortization | 19,913 us-gaap_DepreciationDepletionAndAmortization
General and administrative expense | 14,194 us-gaap_GeneralAndAdministrativeExpense | 11,254 us-gaap_GeneralAndAdministrativeExpense | 11,779 us-gaap_GeneralAndAdministrativeExpense
Bad debt and other expenses | 2,400 egy_ProvisionForDoubtfulAccountsAndOtherExpenses | 3,326 egy_ProvisionForDoubtfulAccountsAndOtherExpenses | 1,621 egy_ProvisionForDoubtfulAccountsAndOtherExpenses
Impairment of proved properties | 98,341 us-gaap_AssetImpairmentCharges |  | 7,620 us-gaap_AssetImpairmentCharges
Total operating costs and expenses | 182,097 us-gaap_CostsAndExpenses | 92,052 us-gaap_CostsAndExpenses | 108,694 us-gaap_CostsAndExpenses
Operating income (loss) | (54,406)us-gaap_OperatingIncomeLoss | 77,225 us-gaap_OperatingIncomeLoss | 86,593 us-gaap_OperatingIncomeLoss
Other income (expense): |  |  |
Interest income | 75 us-gaap_InvestmentIncomeInterest | 73 us-gaap_InvestmentIncomeInterest | 145 us-gaap_InvestmentIncomeInterest
Other, net | (733)us-gaap_OtherNonoperatingIncomeExpense | (111)us-gaap_OtherNonoperatingIncomeExpense | 414 us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense) | (658)us-gaap_NonoperatingIncomeExpense | (38)us-gaap_NonoperatingIncomeExpense | 559 us-gaap_NonoperatingIncomeExpense
Income (loss) before income taxes | (55,064)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 77,187 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 87,152 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense | 22,486 us-gaap_IncomeTaxExpenseBenefit | 34,115 us-gaap_IncomeTaxExpenseBenefit | 81,813 us-gaap_IncomeTaxExpenseBenefit
Net income (loss) | (77,550)us-gaap_ProfitLoss | 43,072 us-gaap_ProfitLoss | 5,339 us-gaap_ProfitLoss
Less net income attributable to noncontrolling interest |  |  | (4,708)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income (loss) attributable to VAALCO Energy, Inc. | $ (77,550)us-gaap_NetIncomeLoss | $ 43,072 us-gaap_NetIncomeLoss | $ 631 us-gaap_NetIncomeLoss
Basic net income (loss) per share atributable to VAALCO Energy, Inc. common shareholders | $ (1.36)us-gaap_EarningsPerShareBasic | $ 0.75 us-gaap_EarningsPerShareBasic | $ 0.01 us-gaap_EarningsPerShareBasic
Diluted net income (loss) per share attributable to VAALCO Energy, Inc. common shareholders | $ (1.36)us-gaap_EarningsPerShareDiluted | $ 0.74 us-gaap_EarningsPerShareDiluted | $ 0.01 us-gaap_EarningsPerShareDiluted
Basic weighted average shares outstanding | 57,229,435 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 57,298,910 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 57,673,342 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted weighted average shares outstanding | 57,229,435 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 57,925,001 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 58,832,059 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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