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Mine Closing, Reclamation, and Gas Well Closing (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
MINE CLOSING, RECLAMATION & GAS WELL CLOSING [Abstract] |  |
Asset Retirement Obligation, Period Increase (Decrease) | $ (9,221)us-gaap_AssetRetirementObligationPeriodIncreaseDecrease |
Asset Retirement Obligation [Roll Forward] |  |
Asset Retirement Obligation, Beginning of Period | 600,875,000 us-gaap_AssetRetirementObligation | 539,177,000 us-gaap_AssetRetirementObligation
Accretion Expense | 42,608,000 us-gaap_AccretionExpense | 41,909,000 us-gaap_AccretionExpense
Asset Retirement Obligation, Cash Paid to Settle | (52,339,000)us-gaap_AssetRetirementObligationCashPaidToSettle | (38,198,000)us-gaap_AssetRetirementObligationCashPaidToSettle
Asset Retirement Obligation, Revision of Estimate | (2,069,000)us-gaap_AssetRetirementObligationRevisionOfEstimate | 42,558,000 us-gaap_AssetRetirementObligationRevisionOfEstimate
Asset Retirement Obligation, Other Change | (13,546,000)cnx_AssetRetirementObligationOtherChange | 15,429,000 cnx_AssetRetirementObligationOtherChange
Asset Retirement Obligations, Significant Changes |  | -4325
Asset Retirement Obligation, End of Period | $ 575,529,000 us-gaap_AssetRetirementObligation | $ 600,875,000 us-gaap_AssetRetirementObligation

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- Definition Asset Retirement Obligation, Other Change + References No definition available. + Details
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- Details
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- Details
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- Definition Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6394232&loc=d3e17558-110866 + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Definition Amount of cash paid during the period to settle an asset retirement obligation. Amounts paid to settle an asset retirement obligation are generally included in the operating section of the Statement of Cash Flows. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3367-108585 + Details
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- Definition Net Increase or Decrease in the asset retirement obligation during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Description of the significant increases or decreases in the carrying amount of the asset retirement obligation during the period, such as changes in significant assumptions used to calculate the carrying amount of the asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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