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INCOME TAXES (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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Dec. 31, 2010
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| INCOME TAXES [Abstract] | ||||
| Decrease in deferred state income tax expense | $ 500,000nog_IncreaseDecreaseInDeferredStateIncomeTaxExpense | |||
| Income tax provision [Abstract] | ||||
| Current Income Taxes | 3,259,445us-gaap_CurrentIncomeTaxExpenseBenefit | (8,386)us-gaap_CurrentIncomeTaxExpenseBenefit | 17,772us-gaap_CurrentIncomeTaxExpenseBenefit | |
| Deferred Income Taxes [Abstract] | ||||
| Federal | 87,625,430us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 29,826,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 39,850,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit | |
| State | 8,482,125us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 1,950,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 3,134,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | |
| Total Expense | 99,367,000us-gaap_IncomeTaxExpenseBenefit | 31,767,614us-gaap_IncomeTaxExpenseBenefit | 43,001,772us-gaap_IncomeTaxExpenseBenefit | |
| Reconciliation of reported amount of income tax expense (benefit) [Abstract] | ||||
| Income Before Taxes and NOL | 263,112,945us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 84,834,650us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 115,286,396us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | |
| Federal Statutory Rate (in hundredths) | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | |
| Taxes Computed at Federal Statutory Rates | 92,090,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 29,692,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 40,350,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | |
| State Taxes, Net of Federal Taxes | 5,404,300us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 909,614us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 2,086,772us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | |
| Non-Deductible Compensation | 1,872,700us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther | 1,166,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther | 565,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther | |
| Total Expense | 99,367,000us-gaap_IncomeTaxExpenseBenefit | 31,767,614us-gaap_IncomeTaxExpenseBenefit | 43,001,772us-gaap_IncomeTaxExpenseBenefit | |
| Deferred Tax Assets [Abstract] | ||||
| Total Deferred Tax Asset | 198,369,445us-gaap_DeferredTaxAssetsGross | 326,895,000us-gaap_DeferredTaxAssetsGross | ||
| Deferred Tax Liabilities [Abstract] | ||||
| Total Current | 43,938,000us-gaap_DeferredTaxLiabilitiesCurrent | 0us-gaap_DeferredTaxLiabilitiesCurrent | ||
| Total Non-Current | 158,412,555us-gaap_DeferredTaxLiabilitiesNoncurrent | 116,674,000us-gaap_DeferredTaxLiabilitiesNoncurrent | ||
| Total Deferred Tax Liability | (400,720,000)us-gaap_DeferredTaxLiabilities | (433,138,000)us-gaap_DeferredTaxLiabilities | ||
| Total Net Deferred Tax Liability | (202,350,555)us-gaap_DeferredTaxAssetsLiabilitiesNet | (106,243,000)us-gaap_DeferredTaxAssetsLiabilitiesNet | ||
| Minimum Amount Tax Benefits Likely Realized Upon Settlement Percentage (in hundredths) | 50.00%nog_MinimumAmountTaxBenefitsLikelyRealizedUponSettlementPercentage | |||
| Unrecognized tax benefits | 0us-gaap_UnrecognizedTaxBenefits | |||
| Unrecognized tax benefits, income tax penalties and interest expense | 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | |
| Unrecognized tax benefits, interest and penalties accrued | 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | ||
| Open tax years | 2014 | 2013 | 2012 | 2011 |
| Current [Member] | ||||
| Deferred Tax Assets [Abstract] | ||||
| Share Based Compensation |
1,141,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_CurrentMember |
1,834,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_CurrentMember |
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| Accrued Interest |
1,238,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_CurrentMember |
1,241,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_CurrentMember |
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| Derivative Instruments |
0us-gaap_DeferredTaxAssetsDerivativeInstruments / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_CurrentMember |
7,094,000us-gaap_DeferredTaxAssetsDerivativeInstruments / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_CurrentMember |
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| Accrued expenses |
986,000nog_DeferredTaxAssetsTaxAccruedExpenses / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_CurrentMember |
0nog_DeferredTaxAssetsTaxAccruedExpenses / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_CurrentMember |
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| Other |
683,000us-gaap_DeferredTaxAssetsOther / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_CurrentMember |
391,000us-gaap_DeferredTaxAssetsOther / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_CurrentMember |
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| Total Current |
4,048,000us-gaap_DeferredTaxAssetsGrossCurrent / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_CurrentMember |
10,560,000us-gaap_DeferredTaxAssetsGrossCurrent / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_CurrentMember |
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| Deferred Tax Liabilities [Abstract] | ||||
| Derivative Instruments |
(47,877,000)us-gaap_DeferredTaxLiabilitiesDerivatives / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_CurrentMember |
0us-gaap_DeferredTaxLiabilitiesDerivatives / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_CurrentMember |
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| Other |
(110,000)us-gaap_DeferredTaxLiabilitiesOther / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_CurrentMember |
(129,000)us-gaap_DeferredTaxLiabilitiesOther / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_CurrentMember |
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| Total Current |
(47,987,000)us-gaap_DeferredTaxLiabilitiesCurrent / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_CurrentMember |
(129,000)us-gaap_DeferredTaxLiabilitiesCurrent / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_CurrentMember |
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| Non-Current [Member] | ||||
| Deferred Tax Assets [Abstract] | ||||
| Other |
94,000us-gaap_DeferredTaxAssetsOther / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_NonCurrentMember |
69,000us-gaap_DeferredTaxAssetsOther / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_NonCurrentMember |
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| Net Operating Loss (NOLs) and Tax Credit Carryforwards |
194,227,445us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_NonCurrentMember |
316,266,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_NonCurrentMember |
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| Total Non-Current |
194,321,445us-gaap_DeferredTaxAssetsGrossNoncurrent / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_NonCurrentMember |
316,335,000us-gaap_DeferredTaxAssetsGrossNoncurrent / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_NonCurrentMember |
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| Deferred Tax Liabilities [Abstract] | ||||
| Derivative Instruments |
(9,076,000)us-gaap_DeferredTaxLiabilitiesDerivatives / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_NonCurrentMember |
(413,000)us-gaap_DeferredTaxLiabilitiesDerivatives / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_NonCurrentMember |
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| Crude Oil and Natural Gas Properties and Other Property |
(343,657,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_NonCurrentMember |
(432,596,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_NonCurrentMember |
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| Total Non-Current |
(352,733,000)us-gaap_DeferredTaxLiabilitiesNoncurrent / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_NonCurrentMember |
(433,009,000)us-gaap_DeferredTaxLiabilitiesNoncurrent / nog_IncomeTaxesDeferredTaxAssetsAndLiabilitiesBalanceSheetClassificationAxis = nog_NonCurrentMember |
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| Federal [Member] | ||||
| Operating Loss Carryforwards [Line Items] | ||||
| Net operating loss carryforward |
516,500,000us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |
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| Alternative minimum tax credit |
$ 3,300,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |
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| Federal [Member] | Minimum [Member] | ||||
| Operating Loss Carryforwards [Line Items] | ||||
| Net operating loss carryforward, expiration date | Dec. 31, 2027 | |||
| Federal [Member] | Maximum [Member] | ||||
| Operating Loss Carryforwards [Line Items] | ||||
| Net operating loss carryforward, expiration date | Dec. 31, 2034 | |||
| X | ||||||||||
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- Definition
An accounting expense recognized in the books before it is paid for. It is a liability, and is usually current. These expenses are typically periodic and documented on a company's balance sheet due to the high probability that they will be collected. No definition available.
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- Definition
The amount of increase (decrease) in deferred state income tax expense due to the change in tax rate during the period. No definition available.
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- Definition
The minimum level for recognizing tax benefits that would potentially be realized in a tax settlement. No definition available.
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- Details
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| X | ||||||||||
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- Definition
Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from derivative instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences from derivatives. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tax year that remains open to examination under enacted tax laws, in CCYY format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Details
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- Details
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