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Long-Term Debt Debt Maturity Schedule (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2014
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term Debt | $ 3,241,474 us-gaap_LongTermDebt | $ 3,118,920 us-gaap_LongTermDebt |
Senior Notes |  | 0 us-gaap_SeniorNotes |
Less amounts due in one year | (5,052)us-gaap_LongTermDebtCurrent | (2,957)us-gaap_LongTermDebtCurrent |
Long-Term Debt | 3,236,422 us-gaap_LongTermDebtNoncurrent | 3,115,963 us-gaap_LongTermDebtNoncurrent |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 4,480 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 4,454 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 2,944 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 1,266 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 904 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five | 3,235,692 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |  |
Long-term Debt | 3,249,740 us-gaap_DebtInstrumentCarryingAmount |  |
Senior Notes Due April 2017 at 8.00% |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_SeniorNotes8PercentDueApril2017ParValueMember | 1,500,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_SeniorNotes8PercentDueApril2017ParValueMember |
Senior notes due April 2020 at 8.25% |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | 1,014,800 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_SeniorNotes825PercentDueApril2020ParValueMemberMember | 1,250,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_SeniorNotes825PercentDueApril2020ParValueMemberMember |
Senior notes due March 2021 at 6.375% |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | 250,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_SeniorSecuredNotesDueMarch2021ParValueMember | 250,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_SeniorSecuredNotesDueMarch2021ParValueMember |
Senior Secured Notes Due April 2022 Par Value [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  |  | 1,856,506 us-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 | 102,865 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_BaltimorePortFacilityRevenueBondsInSeries575PercentDueSeptember2025MemberMember | 102,865 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_BaltimorePortFacilityRevenueBondsInSeries575PercentDueSeptember2025MemberMember |
Advance royalty commitments |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | 13,473 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_AdvanceRoyaltyCommitmentsMember | 11,182 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_AdvanceRoyaltyCommitmentsMember |
Note due through December 2012 at 6.10% |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | $ 3,830 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_NoteDueThroughDecember2012At610MemberMember | $ 4,873 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = cnx_NoteDueThroughDecember2012At610MemberMember |

X
- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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