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Restructuring - Schedule of Restructuring Charges (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Current estimate of remaining accrued restructuring charges
Ending Balance	$ 1,332,186us-gaap_RestructuringReserve
Salary continuation liability
Current estimate of remaining accrued restructuring charges
Beginning Balance	615,721us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = epm_SalaryExpenseRestructuringMember
Payments	(615,721)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = epm_SalaryExpenseRestructuringMember
Adjustment to Cost	0us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringCostAndReserveAxis = epm_SalaryExpenseRestructuringMember
Ending Balance	0us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = epm_SalaryExpenseRestructuringMember
Incentive compensation costs
Current estimate of remaining accrued restructuring charges
Beginning Balance	185,525us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = epm_CashIncentiveRestructuringMember
Payments	(185,525)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = epm_CashIncentiveRestructuringMember
Adjustment to Cost	0us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringCostAndReserveAxis = epm_CashIncentiveRestructuringMember
Ending Balance	0us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = epm_CashIncentiveRestructuringMember
Other benefit costs and employer taxes
Current estimate of remaining accrued restructuring charges
Beginning Balance	154,575us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = epm_OtherBenefitsRestructuringMember
Payments	(110,144)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = epm_OtherBenefitsRestructuringMember
Adjustment to Cost	(44,431)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringCostAndReserveAxis = epm_OtherBenefitsRestructuringMember
Ending Balance	0us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = epm_OtherBenefitsRestructuringMember
Accrued restructuring charges
Current estimate of remaining accrued restructuring charges
Beginning Balance	955,821us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Payments	(911,390)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Adjustment to Cost	(44,431)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Ending Balance	$ 0us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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Balance Type:	credit
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X

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

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X

- Definition

Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 40

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6394291&loc=d3e17658-110867

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