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Long-Term Debt (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Proceeds from (Repayments of) Other Debt	$ 235,200us-gaap_ProceedsFromRepaymentsOfOtherDebt
Proceeds from Issuance of Private Placement	1,600,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement
Debt, Weighted Average Interest Rate	5.90%us-gaap_DebtWeightedAverageInterestRate
Debt Instrument, Convertible, Conversion Price	$ 1.0275us-gaap_DebtInstrumentConvertibleConversionPrice1
Long-term Debt		3,241,474us-gaap_LongTermDebt	3,118,920us-gaap_LongTermDebt
Less amounts due in one year		(5,052)us-gaap_LongTermDebtCurrent	(2,957)us-gaap_LongTermDebtCurrent
Long-Term Debt		3,236,422us-gaap_LongTermDebtNoncurrent	3,115,963us-gaap_LongTermDebtNoncurrent
Debt and Capital Lease Obligations		7,964us-gaap_DebtAndCapitalLeaseObligations	8,498us-gaap_DebtAndCapitalLeaseObligations
Senior Notes Due April 2017 at 8.00%
Debt Instrument [Line Items]
Long-term Debt		0us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_SeniorNotes8PercentDueApril2017ParValueMember	1,500,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_SeniorNotes8PercentDueApril2017ParValueMember
Senior notes due April 2020 at 8.25%
Debt Instrument [Line Items]
Long-term Debt		1,014,800us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_SeniorNotes825PercentDueApril2020ParValueMemberMember	1,250,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_SeniorNotes825PercentDueApril2020ParValueMemberMember
Senior notes due March 2021 at 6.375%
Debt Instrument [Line Items]
Long-term Debt		250,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_SeniorSecuredNotesDueMarch2021ParValueMember	250,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_SeniorSecuredNotesDueMarch2021ParValueMember
Senior Secured Notes Due April 2022 Par Value [Member]
Debt Instrument [Line Items]
Long-term Debt	1,856,506us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_SeniorSecuredNotesDueApril2022ParValueMember
Baltimore Port Facility revenue bonds in series due September 2025 at 5.75%
Debt Instrument [Line Items]
Long-term Debt		102,865us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_BaltimorePortFacilityRevenueBondsInSeries575PercentDueSeptember2025MemberMember	102,865us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_BaltimorePortFacilityRevenueBondsInSeries575PercentDueSeptember2025MemberMember
Advance royalty commitments
Debt Instrument [Line Items]
Long-term Debt		13,473us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_AdvanceRoyaltyCommitmentsMember	11,182us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_AdvanceRoyaltyCommitmentsMember
Note due through December 2012 at 6.10%
Debt Instrument [Line Items]
Long-term Debt		3,830us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_NoteDueThroughDecember2012At610MemberMember	4,873us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_NoteDueThroughDecember2012At610MemberMember
Additional Funding Agreement Terms [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Private Placement	$ 250,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement / us-gaap_LongtermDebtTypeAxis = us-gaap_AdditionalFundingAgreementTermsMember

X

- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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-Publisher FASB

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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- Definition

Weighted average interest rate of debt outstanding.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement.

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