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Property, Plant and Equipment Capital Leases (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Capital Leased Assets [Line Items] |  |
Capital Lease Obligations | $ 87,055 us-gaap_CapitalLeaseObligations | $ 96,015 us-gaap_CapitalLeaseObligations
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation | 49,735 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation | 50,371 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation
jewell ridge pipeline [Member] |  |
Capital Leased Assets [Line Items] |  |
Capital Lease Obligations | 66,919 us-gaap_CapitalLeaseObligations / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cnx_JewellRidgePipelineMember |
Vehicles [Member] |  |
Capital Leased Assets [Line Items] |  |
Capital Lease Obligations | 10,207 us-gaap_CapitalLeaseObligations / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember | 10,652 us-gaap_CapitalLeaseObligations / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember
Computer Equipment [Member] |  |
Capital Leased Assets [Line Items] |  |
Capital Lease Obligations | $ 9,929 us-gaap_CapitalLeaseObligations / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember | $ 18,444 us-gaap_CapitalLeaseObligations / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + 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 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 2) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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