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Supplemental Gas Data Results of Operations (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |
Production Revenue | $ 1,030,574 us-gaap_ResultsOfOperationsSalesRevenueToUnaffiliatedEnterprises | $ 740,869 us-gaap_ResultsOfOperationsSalesRevenueToUnaffiliatedEnterprises | $ 660,442 us-gaap_ResultsOfOperationsSalesRevenueToUnaffiliatedEnterprises
Sales-Gas Royalty Interests | 82,428 cnx_RoyaltyInterestGasRevenue | 63,202 cnx_RoyaltyInterestGasRevenue | 49,405 cnx_RoyaltyInterestGasRevenue
Sales-Purchased Gas | 8,999 us-gaap_RevenueFromPurchasedOilAndGas | 6,531 us-gaap_RevenueFromPurchasedOilAndGas | 3,316 us-gaap_RevenueFromPurchasedOilAndGas
Total Revenue | 1,122,001 us-gaap_ResultsOfOperationsRevenueFromOilAndGasProducingActivities | 810,602 us-gaap_ResultsOfOperationsRevenueFromOilAndGasProducingActivities | 713,163 us-gaap_ResultsOfOperationsRevenueFromOilAndGasProducingActivities
Lifting Costs | 118,391 us-gaap_ResultsOfOperationsProductionOrLiftingCosts | 96,601 us-gaap_ResultsOfOperationsProductionOrLiftingCosts | 90,837 us-gaap_ResultsOfOperationsProductionOrLiftingCosts
Production Tax Expense | 39,418 us-gaap_ProductionTaxExpense | 28,676 us-gaap_ProductionTaxExpense | 26,145 us-gaap_ProductionTaxExpense
Gathering Costs | 258,110 us-gaap_ResultsOfOperationsTransportationCosts | 201,024 us-gaap_ResultsOfOperationsTransportationCosts | 160,579 us-gaap_ResultsOfOperationsTransportationCosts
E&P Direct Administration and Selling | 55,092 cnx_EPDirectAdministrationandSelling | 49,092 cnx_EPDirectAdministrationandSelling | 47,565 cnx_EPDirectAdministrationandSelling
Other Costs |  | 61,107 us-gaap_ResultsOfOperationsExpenseOther | 39,029 us-gaap_ResultsOfOperationsExpenseOther
Purchased Gas Costs | 7,251 us-gaap_CostOfPurchasedOilAndGas | 4,837 us-gaap_CostOfPurchasedOilAndGas | 2,711 us-gaap_CostOfPurchasedOilAndGas
DD&A | 314,381 us-gaap_ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion | 231,809 us-gaap_ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion | 205,149 us-gaap_ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion
Total Costs | 885,308 us-gaap_ResultsOfOperationsExpenseFromOilAndGasProducingActivities | 726,215 us-gaap_ResultsOfOperationsExpenseFromOilAndGasProducingActivities | 610,937 us-gaap_ResultsOfOperationsExpenseFromOilAndGasProducingActivities
Pre-tax Operating Income | 236,693 us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes | 84,387 us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes | 102,226 us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes
Income Taxes | 82,894 us-gaap_ResultsOfOperationsIncomeTaxExpense | 32,067 us-gaap_ResultsOfOperationsIncomeTaxExpense | 38,989 us-gaap_ResultsOfOperationsIncomeTaxExpense
Results of Operations for Producing Activities excluding Corporate and Interest Costs | 153,799 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts | 52,320 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts | 63,237 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts
Cnx Gas Guarantor [Member] |  |  |
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |
Production Tax Expense | 39,418 us-gaap_ProductionTaxExpense / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 28,676 us-gaap_ProductionTaxExpense / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 26,145 us-gaap_ProductionTaxExpense / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember
Gain (Loss) on Sale of Assets | 69,946 us-gaap_DirectOperatingCostRoyaltyExpense / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 53,069 us-gaap_DirectOperatingCostRoyaltyExpense / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 38,922 us-gaap_DirectOperatingCostRoyaltyExpense / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember
E&P Direct Administration and Selling | 55,092 cnx_EPDirectAdministrationandSelling / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 49,092 cnx_EPDirectAdministrationandSelling / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 47,565 cnx_EPDirectAdministrationandSelling / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember
Other Costs | $ 22,719 us-gaap_ResultsOfOperationsExpenseOther / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember |  |

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