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Represents 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.

Name:	epm_DeferredRentExpenses
Namespace Prefix:	epm_
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Represents the change in amount that is due from joint interest partner during the reporting period.

No definition available.

Name:	epm_IncreaseDecreaseInAmountDueFromJointInterestPartner
Namespace Prefix:	epm_
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Represents the change in the amount of receivables during the reporting period from the sale of oil and natural gas of the reporting entity.

No definition available.

Name:	epm_IncreaseDecreaseInReceivablesFromOilAndNaturalGasSales
Namespace Prefix:	epm_
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Represents the increase in accounts payable in relation to joint venture activities from noncash transactions.

No definition available.

Name:	epm_IncreaseInAccountsPayableRelatedToJointVentureActivities
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This element represents oil and natural gas properties incurred through recognition of asset retirement obligations settlement transactions that were settled using noncash vehicles.

No definition available.

Name:	epm_OilAndNaturalGasPropertiesIncurredThroughRecognitionOfAssetRetirementObligations
Namespace Prefix:	epm_
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Represents the cash outflow in relation to the acquisition of oil and gas properties during the reporting period.

No definition available.

Name:	epm_PaymentForAcquisitionOfOilAndGasProperties
Namespace Prefix:	epm_
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Period Type:	duration

Represents the cash outflow in relation to the development of oil and gas properties during the reporting period.

No definition available.

Name:	epm_PaymentForDevelopmentOfOilAndGasProperties
Namespace Prefix:	epm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the cash outflow during the reporting period for asset retirement obligations.

No definition available.

Name:	epm_PaymentsOnAssetRetirementObligations
Namespace Prefix:	epm_
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The cash inflow from the additional capital contribution to the entity from the issue of restricted shares.

No definition available.

Name:	epm_ProceedsFromIssuanceOfRestrictedStock
Namespace Prefix:	epm_
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This 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.

Name:	epm_ProceedsFromMaturitiesOfCertificatesOfDeposit
Namespace Prefix:	epm_
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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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-Name Accounting Standards Codification

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-Section 50

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-Name Statement of Financial Accounting Standard (FAS)

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-Topic 410

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Name:	us-gaap_AssetRetirementObligationAccretionExpense
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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).

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-Name Regulation S-X (SX)

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-Name Accounting Standards Codification

-Topic 210

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-URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765

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-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

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-Name Statement of Financial Accounting Standard (FAS)

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-Glossary Cash Equivalents

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Glossary Deferred Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6510177

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-Name Regulation S-X (SX)

-Number 210

-Section 08

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-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section I

-Subsection 7

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-Name Accounting Standards Codification

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-Subparagraph (SX 210.4-08.(h))

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-Subparagraph (SAB TOPIC 6.I.7)

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Name:	us-gaap_DeferredIncomeTaxExpenseBenefit
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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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-Publisher FASB

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Balance Type:	debit
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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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Name:	us-gaap_IncomeTaxesPaid
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Paragraph 28

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Name:	us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The increase (decrease) during the reporting period of all taxes owed but not paid, including income, property and other taxes.

No definition available.

Name:	us-gaap_IncreaseDecreaseInAccruedTaxesPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The increase (decrease) during the reporting period in income taxes receivable, which represents the amount due from tax authorities for refunds of overpayments or recoveries of income taxes paid.

Name:	us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration

Name:	us-gaap_IncreaseDecreaseInOperatingCapitalAbstract
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The increase (decrease) during the reporting period in the value of prepaid expenses and other assets not separately disclosed in the statement of cash flows, for example, deferred expenses, intangible assets,or income taxes.

Name:	us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Namespace Prefix:	us-gaap_
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Balance Type:	credit
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The increase (decrease) during the reporting period in the obligations due for compensation payments related to the use of copyrights, patents, trade names, licenses, technology. Royalty payments are also paid by the lease holders for oil, gas, and mineral extraction.

Name:	us-gaap_IncreaseDecreaseInRoyaltiesPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The increase (decrease) in cash associated with the entity's continuing operating, investing, and financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

No definition available.

Name:	us-gaap_NetCashProvidedByUsedInContinuingOperations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

The net cash from (used in) the entity's financing activities specifically EXCLUDING the cash flows derived by the entity from its discontinued operations, if any. This element is only to be used when the entity reports its cash flows attributable to discontinued operations separately from the cash flow provided by or used in financing activities. Such reporting would necessitate the entity to use the Net Cash provided by or used in Discontinued Operations, Total element provided in the taxonomy.

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The net cash from (used in) the entity's investing activities specifically EXCLUDING the cash flows derived by the entity from its discontinued operations, if any. This element is only to be used when the entity reports its cash flows attributable to discontinued operations separately from the cash flow provided by or used in investing activities. Such reporting would necessitate the entity to use the Net Cash provided by or used in Discontinued Operations, Total element provided in the taxonomy.

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Namespace Prefix:	us-gaap_
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The net cash from (used in) the entity's continuing operations. This element specifically EXCLUDES the cash flows derived by the entity from its discontinued operations, if any. This element is only to be used when the entity reports its cash flows attributable to discontinued operations separately from the cash flow provided by or used in operating activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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-Name Statement of Financial Accounting Standard (FAS)

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Namespace Prefix:	us-gaap_
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.22)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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-Name Accounting Standards Codification

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-Topic 225

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-Subparagraph (SX 210.5-03.18)

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-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 38

-Subparagraph a

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

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-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e565-108580

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-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph A7

-Appendix A

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-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 10, 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.

Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Other Comprehensive Income

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-Name Accounting Research Bulletin (ARB)

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-Name Emerging Issues Task Force (EITF)

-Number 87-21

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-Publisher FASB

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Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.

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The 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.

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The cash outflow for the return on capital for preferred shareholders.

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The 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.

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The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

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Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation.

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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-Publisher FASB

-Name Accounting Standards Codification

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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