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Stock-Based Incentive Plan - Contingent Restricted Stock Activity (Details) (USD $)
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Contingent Restricted Stock    
Number of Restricted Stock Units    
Unvested at the beginning of the period (in shares)   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= epm_ContingentRestrictedStockGrantsMember
Unvested at the end of the period (in shares) 56,286us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= epm_ContingentRestrictedStockGrantsMember
56,286us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= epm_ContingentRestrictedStockGrantsMember
Weighted Average Grant-Date Fair Value    
Unvested at the beginning of the period (in dollars per share)   $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= epm_ContingentRestrictedStockGrantsMember
Unvested at the end of the period (in dollars per share) $ 8.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= epm_ContingentRestrictedStockGrantsMember
$ 8.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= epm_ContingentRestrictedStockGrantsMember
Additional disclosures of restricted stock    
Unrecognized stock compensation expense related to Restricted Stock $ 62,787us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= epm_ContingentRestrictedStockGrantsMember
[1] $ 62,787us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= epm_ContingentRestrictedStockGrantsMember
[1]
Weighted average remaining service period over which unrecognized compensation cost is expected to be recognized   2 years 8 months 12 days
Contingent Restricted Stock, Performance-Based    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Potential future compensation expense $ 385,166epm_SharebasedCompensationArrangementbySharebasedPaymentAwardPotentialFutureAllocatedSharebasedCompensationExpenseNotProbable
/ us-gaap_AwardTypeAxis
= epm_ContingentRestrictedStockPerformanceBasedMember
 
Number of Restricted Stock Units    
Granted (in shares)   38,325us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= epm_ContingentRestrictedStockPerformanceBasedMember
Weighted Average Grant-Date Fair Value    
Granted (in dollars per share)   $ 10.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= epm_ContingentRestrictedStockPerformanceBasedMember
Contingent Restricted Stock, Market-Based    
Number of Restricted Stock Units    
Granted (in shares)   17,961us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= epm_ContingentRestrictedStockMarketBasedMember
Weighted Average Grant-Date Fair Value    
Granted (in dollars per share)   $ 4.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= epm_ContingentRestrictedStockMarketBasedMember
[1] Excludes $385,166 of potential future compensation expense for performance-based awards for which vesting is not considered probable at this time for accounting purposes.