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Unsecured Revolving Credit Agreement (Details) (USD $) | 1 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 29, 2012 | Dec. 31, 2012
Revolving credit facility |  |
Unsecured Revolving Credit Agreement |  |
Maximum amount available under revolving credit facility | $ 50,000,000 |
Initial borrowing base | 5,000,000 | 5,000,000
Term of revolving credit facility |  | 4 years
Value of oil and gas properties subject (as a percent) |  | 25.00%
Margin added to variable interest rate basis (as a percent) |  | 0.50%
Loan costs to be compensated to lender over the life of the Credit Agreement | 50,000 |
Debt issuance costs | 179,468 |
Revolving credit facility | Maximum |  |
Unsecured Revolving Credit Agreement |  |
Current ratio |  | 1.5
Total funded indebtedness to EBITDA ratio |  | 2.5
EBITDA to interest expense ratio |  | 3
Revolving credit facility | LIBOR |  |
Unsecured Revolving Credit Agreement |  |
Variable interest rate basis |  | Adjusted LIBOR
Amount to be reduced by Lender's Regulation D reserve requirement |  | 1
Interest period one |  | 1 month
Interest period two |  | 2 months
Interest period three |  | 3 months
Interest period four |  | 6 months
Term for payment of interest |  | 3 months
Revolving credit facility | LIBOR | Maximum |  |
Unsecured Revolving Credit Agreement |  |
Number of loans that can be outstanding at any time |  | 3
Revolving credit facility | Prime rate |  |
Unsecured Revolving Credit Agreement |  |
Variable interest rate basis |  | Lender's prime rate
Revolving credit facility | Federal funds rate |  |
Unsecured Revolving Credit Agreement |  |
Variable interest rate basis |  | Federal Fund Rate
Commitment fee accruing on unutilized availability (as a percent) |  | 0.50%
Letter of credit |  |
Unsecured Revolving Credit Agreement |  |
Maximum amount available under revolving credit facility | $ 1,000,000 |
Letter of credit fees rate applied to principal amounts (as a percent) |  | 3.50%
Letter of credit | Maximum |  |
Unsecured Revolving Credit Agreement |  |
Term of revolving credit facility |  | 1 year

X
- Definition Represents the ratio of consolidated earnings before interest, taxes, depreciation and amortization to interest expense, which is necessary to be maintained under the terms of the covenants to the credit facility. + References No definition available. + Details
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Balance Type: | na
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X
- Definition Represents the ratio of consolidated total funded indebtedness to consolidated earnings before, interest, taxes, depreciation and amortization allowed under the covenants of the credit facility. + References No definition available. + Details
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X
- Definition Represents the current ratio allowed under the covenants of the credit facility. + References No definition available. + Details
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X
- Definition Represents the term of interest period four of a debt instrument. + References No definition available. + Details
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Period Type: | duration

X
- Definition Represents the term of interest period one of a debt instrument. + References No definition available. + Details
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- Definition Represents the term covered by an interest payment for a debt instrument interest period. + References No definition available. + Details
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- Definition Represents the term of interest period three of a debt instrument. + References No definition available. + Details
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- Definition Represents the term of interest period two of a debt instrument. + References No definition available. + Details
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X
- Definition Represents the term of the debt agreement. + References No definition available. + Details
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X
- Definition The amount that is to be reduced by the Lender's Regulation D reserve requirement, used to determine the adjusted variable rate to the debt instrument. + References No definition available. + Details
Name: | epm_DebtInstrumentVariableRateBasisAmountToBeReducedByLenderRegulationDReserveRequirement
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X
- Definition Represents the amount to be compensated to the lender for incurred loan costs upon closing of Credit Agreement. + References No definition available. + Details
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- Definition Represents the number of loans that can be outstanding at any time. + References No definition available. + Details
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X
- Definition Represents the percentage of the value of the oil and gas properties as a limitation of borrowing amount. + References No definition available. + Details
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- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). + References No definition available. + Details
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X
- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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