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Supplemental Coal Data (Unaudited) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 T | Dec. 31, 2013 T | Dec. 31, 2012 T | Dec. 31, 2011 T | Dec. 31, 2010 T | Dec. 31, 2009 T
Reserve Quantities [Line Items] |  |  |  |  |  |
Proven properties |  | $ 1,670,404 us-gaap_CapitalizedCostsProvedProperties |  |  |  |
Proved Oil and Gas Property, Successful Effort Method | 1,768,007 us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod | 1,670,404 us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod |  |  |  |
Reserve Quantities [Roll Forward] |  |  |  |  |  |
Proved Developed and Undeveloped Reserves, Production | 235,714,000 us-gaap_ProvedDevelopedAndUndevelopedReservesProduction | 172,380,000 us-gaap_ProvedDevelopedAndUndevelopedReservesProduction | 156,325,000 us-gaap_ProvedDevelopedAndUndevelopedReservesProduction |  |  |
Net change due to revisions in quantity estimates | 151,233 us-gaap_RevisionsOfPreviousQuantityEstimates | 132,900 us-gaap_RevisionsOfPreviousQuantityEstimates | (104,158)us-gaap_RevisionsOfPreviousQuantityEstimates |  |  |
Unproven properties |  | 1,463,406 us-gaap_CapitalizedCostsUnprovedProperties |  |  |  |
Unproved Oil and Gas Property, Successful Effort Method | 1,540,835 us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod | 1,463,406 us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod |  |  |  |
Steam [Member] |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |
Proved Undeveloped Reserve (Mass) | 2,759,000 cnx_ProvedUndevelopedReserveMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_SteamMember |  |  |  |  |
Coal Segment [Member] |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |
Proved Undeveloped Reserve (Mass) | 3,238,000,000 cnx_ProvedUndevelopedReserveMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | 3,032,000,000 cnx_ProvedUndevelopedReserveMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | 4,229,000,000 cnx_ProvedUndevelopedReserveMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | 4,314,000,000 cnx_ProvedUndevelopedReserveMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | 4,229,000,000 cnx_ProvedUndevelopedReserveMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | 4,350,000,000 cnx_ProvedUndevelopedReserveMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember
Reserve Quantities [Roll Forward] |  |  |  |  |  |
Purchase of minerals in place (Mass) | 0 cnx_PurchaseOfMineralsInPlaceMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | 1,000,000 cnx_PurchaseOfMineralsInPlaceMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | 0 cnx_PurchaseOfMineralsInPlaceMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | 6,000,000 cnx_PurchaseOfMineralsInPlaceMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | 4,000,000 cnx_PurchaseOfMineralsInPlaceMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember |
Sales of minerals in place (Mass) | (233,000,000)cnx_SalesOfMineralsInPlaceMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | (1,199,000,000)cnx_SalesOfMineralsInPlaceMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | (155,000,000)cnx_SalesOfMineralsInPlaceMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | 0 cnx_SalesOfMineralsInPlaceMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | (41,000,000)cnx_SalesOfMineralsInPlaceMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember |
Production of proved reserves (Mass) | (32,000,000)cnx_ProductionOfProvedReservesMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | (55,000,000)cnx_ProductionOfProvedReservesMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | (55,000,000)cnx_ProductionOfProvedReservesMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | (62,000,000)cnx_ProductionOfProvedReservesMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | (62,000,000)cnx_ProductionOfProvedReservesMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember |
Net change due to revisions in quantity estimates | $ 471,000 us-gaap_RevisionsOfPreviousQuantityEstimates / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | $ 56,000 us-gaap_RevisionsOfPreviousQuantityEstimates / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | $ 125,000 us-gaap_RevisionsOfPreviousQuantityEstimates / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | $ 141,000 us-gaap_RevisionsOfPreviousQuantityEstimates / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember | $ (22,000)us-gaap_RevisionsOfPreviousQuantityEstimates / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_CoalSegmentMember |
metallurgical coal [Member] |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |
Proved Undeveloped Reserve (Mass) | 480,000,000 cnx_ProvedUndevelopedReserveMass / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = cnx_MetallurgicalCoalMember |  |  |  |  |
Affiliated Entity [Member] |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |
Proved Undeveloped Reserve (Mass) |  | 55,000,000 cnx_ProvedUndevelopedReserveMass / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 57,000,000 cnx_ProvedUndevelopedReserveMass / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 41,000,000 cnx_ProvedUndevelopedReserveMass / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 145,000,000 cnx_ProvedUndevelopedReserveMass / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 172,000,000 cnx_ProvedUndevelopedReserveMass / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember

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- Definition Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Glossary Proved Properties -URI http://asc.fasb.org/extlink&oid=6522428 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Properties -URI http://asc.fasb.org/extlink&oid=21914647 + Details
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