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Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6510177 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 false2Deferred income taxes9false 4epm_DeferredRentExpensesepm_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-17146-17146falsefalsefalse2truefalsefalse-15401-15401falsefalsefalse3truefalsefalse37773777falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the amount charged to expense during the reporting period that has been paid in lump sum in earlier reporting periods as rent expenses.No definition available.false2Deferred rent10false 4us-gaap_OtherNoncashIncomeExpenseus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse3208032080falsefalsefalsexbrli:monetaryItemTypemonetaryOther income (expense) included in net income that results in no cash inflows or outflows in the period. 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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Proceeds from asset sales22false 3epm_PaymentForDevelopmentOfOilAndGasPropertiesepm_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-4163080-4163080falsefalsefalse2truefalsefalse-3291921-3291921falsefalsefalse3truefalsefalse-2509652-2509652falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the cash outflow in relation to the development of oil and gas properties during the reporting period.No definition available.false2Development of oil and natural gas properties23false 3epm_PaymentForAcquisitionOfOilAndGasPropertiesepm_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-755194-755194falsefalsefalse2truefalsefalse-3768162-3768162falsefalsefalse3truefalsefalse-997279-997279falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the cash outflow in relation to the acquisition of oil and gas properties during the reporting period.No definition available.false2Acquisitions of oil and natural gas properties24false 3us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipmentus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1falsefalsefalse00falsefalsefalse2truefalsefalse-61176-61176falsefalsefalse3truefalsefalse-864-864falsefalsefalsexbrli:monetaryItemTypemonetaryThe cash outflow for acquisition of or capital improvements of property, plant and equipment, used to produce goods or deliver services, and not otherwise defined in the taxonomy.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=6943989&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Capital expenditures for other equipment25false 3us-gaap_PaymentsToAcquireInterestInJointVentureus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1falsefalsefalse00falsefalsefalse2truefalsefalse-224206-224206falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Advances to joint venture operating partner26false 3epm_ProceedsFromMaturitiesOfCertificatesOfDepositepm_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse11000001100000falsefalsefalsexbrli:monetaryItemTypemonetaryThis element depicts the amount that the reporting entity received when certificates of deposit matured on their specified due date during the reporting period.No definition available.false2Maturities of certificates of deposit27false 3us-gaap_PaymentsForProceedsFromOtherInvestingActivitiesus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-32160-32160falsefalsefalse2truefalsefalse-35056-35056falsefalsefalse3truefalsefalse-48702-48702falsefalsefalsexbrli:monetaryItemTypemonetaryThe net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.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 8 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3098-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Other assets28false 3us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-1470458-1470458falsefalsefalse2truefalsefalse-6580911-6580911falsefalsefalse3truefalsefalse-2225171-2225171falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of net cash from (used in) the entity's investing activities, excluding cash flows derived by the entity from its discontinued operations.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=6943989&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=6943989&loc=d3e3574-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Proceeds from the exercise of stock options33false 3epm_PaymentsForPurchaseOfTreasuryStockCostMethodepm_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-137818-137818falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe cash outflow resulting from purchase of the treasury stock under the cost method.No definition available.false2Purchases of treasury stock34false 3us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStockus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-674302-674302falsefalsefalse2truefalsefalse-630391-630391falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryCash outflow in the form of ordinary dividends to preferred shareholders, generally out of earnings.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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=6943989&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Preferred stock dividends paid35false 3us-gaap_PaymentsOfDebtIssuanceCostsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-16211-16211falsefalsefalse2truefalsefalse-163257-163257falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe 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.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=6943989&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 95-13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Deferred loan costs36false 3us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivitiesus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse794569794569falsefalsefalse2truefalsefalse249728249728falsefalsefalse3truefalsefalse173157173157falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of excess tax benefit (tax deficiency) that arises when compensation cost from non-qualified share-based compensation recognized on the entity's tax return exceeds (is less than) compensation cost from equity-based compensation recognized in financial statements. Excess tax benefit (tax deficiency) increases (decreases) net cash provided by financing activities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6576910&loc=d3e11374-113907 false2Windfall tax benefit37false 3us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse3698936989falsefalsefalse2truefalsefalse63866156386615falsefalsefalse3truefalsefalse279234279234falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of net cash from (used in) the entity's financing activities, excluding cash flows derived by the entity from its discontinued operations.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=6943989&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=6943989&loc=d3e3574-108585 true2Net cash provided by financing activities38false 2us-gaap_NetCashProvidedByUsedInContinuingOperationsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse1050003710500037falsefalsefalse2truefalsefalse1018111010181110falsefalsefalse3truefalsefalse11091791109179falsefalsefalsexbrli:monetaryItemTypemonetaryThe increase (decrease) in cash associated with the entity's continuing operating, investing, and financing activities. 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