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Subsequent Event (Details)	Jan. 05, 2021
Revolving credit facility | Senior Secured Reserve-Based Credit Facility | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Minimum current ratio	1.00

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- Definition

Debt Instrument, Covenant, Minimum Current Ratio

+ References

No definition available.

+ Details

Name:	epm_DebtInstrumentCovenantMinimumCurrentRatio
Namespace Prefix:	epm_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=epm_SeniorSecuredReserveBasedCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: