XML 15 R46.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Subsequent Event - (Details) (Subsequent Event, USD $) In Thousands, unless otherwise specified | 0 Months Ended |
--- | --- | ---
Oct. 24, 2014 Mississippian Lime properties | Nov. 01, 2014 Dehli Field
Subsequent Event [Line Items] |  |
Proceeds from sale of joint venture interest | $ 400 |
Reversionary working interest |  | 23.90%
Associated revenue interest |  | 19.10%
Royalty and overriding royalty interest |  | 7.40%
Total net revenue interest |  | 26.50%
Percentage of operating costs and capital expenditures responsible to pay |  | 23.90%

X
- Definition Gas And Oil Properties, Total Net Revenue Interest, Percentage + References No definition available. + Details
Name: | epm_GasAndOilPropertiesTotalNetRevenueInterestPercentage
Namespace Prefix: | epm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Oil And Gas Properties, Operating Costs And Capital Expenditures, Percentage of Liability to Pay + References No definition available. + Details
Name: | epm_OilAndGasPropertiesOperatingCostsAndCapitalExpendituresPercentageofLiabilitytoPay
Namespace Prefix: | epm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Oil And Gas Properties, Revenue Interest Percentage Related to Reversionary Working Interest + References No definition available. + Details
Name: | epm_OilAndGasPropertiesRevenueInterestPercentageRelatedtoReversionaryWorkingInterest
Namespace Prefix: | epm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Oil And Gas Properties, Reversionary Working Interest Percentage + References No definition available. + Details
Name: | epm_OilAndGasPropertiesReversionaryWorkingInterestPercentage
Namespace Prefix: | epm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Oil And Gas Properties, Royalty And Overriding Royalty Interests + References No definition available. + Details
Name: | epm_OilAndGasPropertiesRoyaltyAndOverridingRoyaltyInterests
Namespace Prefix: | epm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow from the sale of an investment interest in a joint venture that the reporting entity has not previously accounted for using consolidation or the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromDivestitureOfInterestInJointVenture
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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