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DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT, Part 2 (Details) (USD $)
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12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Derivative Assets [Abstract] | |||
| Derivative Assets, Current | $ 128,893,220us-gaap_DerivativeAssetsCurrent | $ 62,890us-gaap_DerivativeAssetsCurrent | |
| Derivative Assets, Noncurrent | 25,013,011us-gaap_DerivativeAssetsNoncurrent | 1,745,405us-gaap_DerivativeAssetsNoncurrent | |
| Derivative Liabilities [Abstract] | |||
| Derivative Liabilities, Current | 0us-gaap_DerivativeLiabilitiesCurrent | (19,119,646)us-gaap_DerivativeLiabilitiesCurrent | |
| Derivative Liabilities, Noncurrent | (579,070)us-gaap_DerivativeLiabilitiesNoncurrent | (637,208)us-gaap_DerivativeLiabilitiesNoncurrent | |
| Total Derivatives Liabilities | (579,070)nog_DerivativeLiabilityByClassificationTotal | (19,756,854)nog_DerivativeLiabilityByClassificationTotal | |
| Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | |||
| Derivative Liabilities [Abstract] | |||
| Loss on settled derivatives reclassified to income |
0us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
0us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
101,309us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
| Total Assets [Member] | |||
| Derivative Assets [Abstract] | |||
| Total Derivatives Assets |
153,906,231us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = nog_TotalAssetsMember |
1,808,295us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = nog_TotalAssetsMember |
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| Swap Contracts [Member] | Current Assets/Liabilities [Member] | |||
| Derivative Assets [Abstract] | |||
| Derivative Assets, Current |
128,893,220us-gaap_DerivativeAssetsCurrent / us-gaap_BalanceSheetLocationAxis = nog_CurrentAssetsLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = nog_SwapContractsMember |
62,890us-gaap_DerivativeAssetsCurrent / us-gaap_BalanceSheetLocationAxis = nog_CurrentAssetsLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = nog_SwapContractsMember |
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| Derivative Liabilities [Abstract] | |||
| Derivative Liabilities, Current |
0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_BalanceSheetLocationAxis = nog_CurrentAssetsLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = nog_SwapContractsMember |
(19,111,820)us-gaap_DerivativeLiabilitiesCurrent / us-gaap_BalanceSheetLocationAxis = nog_CurrentAssetsLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = nog_SwapContractsMember |
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| Swap Contracts [Member] | Non-Current Assets/Liabilities [Member] | |||
| Derivative Assets [Abstract] | |||
| Derivative Assets, Noncurrent |
25,013,011us-gaap_DerivativeAssetsNoncurrent / us-gaap_BalanceSheetLocationAxis = nog_NonCurrentAssetsLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = nog_SwapContractsMember |
1,745,405us-gaap_DerivativeAssetsNoncurrent / us-gaap_BalanceSheetLocationAxis = nog_NonCurrentAssetsLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = nog_SwapContractsMember |
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| Derivative Liabilities [Abstract] | |||
| Derivative Liabilities, Noncurrent |
0us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_BalanceSheetLocationAxis = nog_NonCurrentAssetsLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = nog_SwapContractsMember |
(637,208)us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_BalanceSheetLocationAxis = nog_NonCurrentAssetsLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = nog_SwapContractsMember |
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| Costless Collars [Member] | Current Assets/Liabilities [Member] | |||
| Derivative Liabilities [Abstract] | |||
| Derivative Liabilities, Current |
0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_BalanceSheetLocationAxis = nog_CurrentAssetsLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = nog_CostlessCollarsMember |
(7,826)us-gaap_DerivativeLiabilitiesCurrent / us-gaap_BalanceSheetLocationAxis = nog_CurrentAssetsLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = nog_CostlessCollarsMember |
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| Swaption Contracts [Member] | Non-Current Assets/Liabilities [Member] | |||
| Derivative Liabilities [Abstract] | |||
| Derivative Liabilities, Noncurrent |
$ (579,070)us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_BalanceSheetLocationAxis = nog_NonCurrentAssetsLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_SwaptionMember |
$ 0us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_BalanceSheetLocationAxis = nog_NonCurrentAssetsLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_SwaptionMember |
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- Definition
Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. No definition available.
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- Definition
Fair value, after the effects of master netting arrangements, of a 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. Includes assets not subject to a master netting arrangement and not elected to be offset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fair value, after the effects of master netting arrangements, of a 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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fair value, after the effects of master netting arrangements, of a 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, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fair value, after the effects of master netting arrangements, of a financial liability or 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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fair value, after the effects of master netting arrangements, of a financial liability or 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, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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