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Subsequent Events (Details) - Subsequent Event - USD ($) $ / shares in Units, $ in Millions	May 07, 2021	May 06, 2021
Subsequent Event [Line Items]
Dividend declared (in dollars per share)		$ 0.05
Barnett Shale
Subsequent Event [Line Items]
Non-operating working interest, percent	17.00%
Revenue interest, percent	14.00%
Purchase price of oil and gas assets	$ 18.2

X

- Definition

Non-Operating Working Interest, Percent

+ References

No definition available.

+ Details

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Namespace Prefix:	epm_
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Balance Type:	na
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X

- Definition

Revenue Interest, Percent

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

+ Details

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X

- Definition

The cash outflow to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

+ Details

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Balance Type:	credit
Period Type:	duration

X

- 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

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- Details

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X

- Details

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