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Commodity Price Risk Management (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Derivative Liability, Fair Value, Net [Abstract] |  |
Realized derivative (loss) | $ (114)us-gaap_GainLossFromPriceRiskManagementActivity | $ (158)us-gaap_GainLossFromPriceRiskManagementActivity
Unrealized derivative (loss) | (63)us-gaap_UnrealizedGainLossOnDerivatives | (173)us-gaap_UnrealizedGainLossOnDerivatives
Total realized and unrealized derivative (loss) | (177)us-gaap_DerivativeGainLossOnDerivativeNet | (331)us-gaap_DerivativeGainLossOnDerivativeNet
Current Asset [Member] | Crude Oil Derivative Contract [Member] |  |
Derivative Asset, Fair Value, Net [Abstract] |  |
Derivative Assets, Gross | 287 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = useg_CrudeOilDerivativeContractMember / us-gaap_BalanceSheetLocationAxis = useg_CurrentAssetMember |
Derivative Asset, Gross amount offset in | (287)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = useg_CrudeOilDerivativeContractMember / us-gaap_BalanceSheetLocationAxis = useg_CurrentAssetMember |
Derivative Asset, Net amount of assets | 0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = useg_CrudeOilDerivativeContractMember / us-gaap_BalanceSheetLocationAxis = useg_CurrentAssetMember |
Current Liability [Member] | Crude Oil Derivative Contract [Member] |  |
Derivative Liability, Fair Value, Net [Abstract] |  |
Derivative Liability, Gross | 350 us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = useg_CrudeOilDerivativeContractMember / us-gaap_BalanceSheetLocationAxis = useg_CurrentLiabilityMember |
Derivative Liabilities, Gross amount offset in | (287)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = useg_CrudeOilDerivativeContractMember / us-gaap_BalanceSheetLocationAxis = useg_CurrentLiabilityMember |
Derivative Liability, Net amount of assets | $ 63 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = useg_CrudeOilDerivativeContractMember / us-gaap_BalanceSheetLocationAxis = useg_CurrentLiabilityMember |
Crude Oil Put 02/01/15 - 04/30/15 [Member] |  |
Derivative [Line Items] |  |
Counterparty | Wells Fargo |
Basis | WTI |
Quantity (barrels per day) | 500 useg_PortionOfFutureOilAndGasProductionBeingHedgedPerDay / us-gaap_TradingActivityByTypeAxis = useg_CrudeOilPutMember |
Crude Oil Put 02/01/15 - 04/30/15 [Member] | Put Option [Member] |  |
Derivative [Line Items] |  |
Strike Price (in dollars per barrel) | 46.00 us-gaap_DerivativePriceRiskOptionStrikePrice / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_PutOptionMember / us-gaap_TradingActivityByTypeAxis = useg_CrudeOilPutMember |
Crude Oil Costless Collar 05/01/15 - 12/31/15 [Member] |  |
Derivative [Line Items] |  |
Counterparty | Wells Fargo |
Basis | WTI |
Quantity (barrels per day) | 500 useg_PortionOfFutureOilAndGasProductionBeingHedgedPerDay / us-gaap_TradingActivityByTypeAxis = useg_CrudeOilCostlessCollarSettlementDateNineMember |
Crude Oil Costless Collar 05/01/15 - 12/31/15 [Member] | Put Option [Member] |  |
Derivative [Line Items] |  |
Strike Price (in dollars per barrel) | 45.00 us-gaap_DerivativePriceRiskOptionStrikePrice / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_PutOptionMember / us-gaap_TradingActivityByTypeAxis = useg_CrudeOilCostlessCollarSettlementDateNineMember |
Crude Oil Costless Collar 05/01/15 - 12/31/15 [Member] | Call Option [Member] |  |
Derivative [Line Items] |  |
Strike Price (in dollars per barrel) | 58.79 us-gaap_DerivativePriceRiskOptionStrikePrice / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_CallOptionMember / us-gaap_TradingActivityByTypeAxis = useg_CrudeOilCostlessCollarSettlementDateNineMember |

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- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226003-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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