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Supplemental Gas Data Average Unit Prices (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 MMcf | Dec. 31, 2013 MMcf | Dec. 31, 2012 MMcf
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume | 153.5 us-gaap_OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume |  |
Proved Developed and Undeveloped Reserves, Production | 235,714,000 us-gaap_ProvedDevelopedAndUndevelopedReservesProduction | 172,380,000 us-gaap_ProvedDevelopedAndUndevelopedReservesProduction | 156,325,000 us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
Natural Gas, Per Thousand Cubic Feet [Member] |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Average Gas Sales Price before effects of financial settlements | 4.26 cnx_AverageGasSalesPriceBeforeEffectsOfFinancialSettlements / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasPerThousandCubicFeetMember | 3.85 cnx_AverageGasSalesPriceBeforeEffectsOfFinancialSettlements / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasPerThousandCubicFeetMember | 3.00 cnx_AverageGasSalesPriceBeforeEffectsOfFinancialSettlements / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasPerThousandCubicFeetMember
Average effects of financial settlements (per thousand cubic feet) | 0.11 cnx_AverageEffectsOfFinancialSettlementsPerThousandCubicFeet / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasPerThousandCubicFeetMember | 0.45 cnx_AverageEffectsOfFinancialSettlementsPerThousandCubicFeet / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasPerThousandCubicFeetMember | 1.22 cnx_AverageEffectsOfFinancialSettlementsPerThousandCubicFeet / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasPerThousandCubicFeetMember
Average gas sales price including effects of financial settlements (per thousand cubic feet) | 4.37 cnx_AverageGasSalesPriceIncludingEffectsOfFinancialSettlementsPerThousandCubicFeet / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasPerThousandCubicFeetMember | 4.30 cnx_AverageGasSalesPriceIncludingEffectsOfFinancialSettlementsPerThousandCubicFeet / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasPerThousandCubicFeetMember | 4.22 cnx_AverageGasSalesPriceIncludingEffectsOfFinancialSettlementsPerThousandCubicFeet / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasPerThousandCubicFeetMember
Average lifting costs, excluding ad valorem and severance taxes (per thousand cubic feet) | .5 | .56 | .58

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- Definition Summary of significant aspects of production costs of the energy source on a per unit basis. This information is presented in different formats, including certain specific costs, summarized costs or costs in total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 2 -Paragraph 3 -Subparagraph A + Details
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