Name:	epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsNonvestedOutstandingNumber
Namespace Prefix:	epm_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsNonvestedRollForward
Namespace Prefix:	epm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The weighted average fair value of nonvested stock options and incentive warrants for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

No definition available.

Name:	epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsNonvestedWeightedAverageGrantDateFairValue
Namespace Prefix:	epm_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsNonvestedWeightedAverageGrantDateFairValueRollForward
Namespace Prefix:	epm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The number of Stock Options and Incentive Warrants that vested during the reporting period.

No definition available.

Name:	epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsVestedInPeriod
Namespace Prefix:	epm_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The total fair value as of the grant date of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

No definition available.

Name:	epm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndIncentiveWarrantsVestedInPeriodTotalGrantDateFairValue
Namespace Prefix:	epm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The weighted average fair value as of grant date pertaining to stock options or incentive warrants for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

No definition available.