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Supplemental Cash Flow Supplemental Cash Flow (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Supplemental Cash Flow Information [Abstract] |  |  |
Income Taxes Paid | $ (81,962,000)us-gaap_IncomeTaxesPaid | $ 35,079,000 us-gaap_IncomeTaxesPaid | $ 121,245,000 us-gaap_IncomeTaxesPaid
Interest Paid, Net | 233,631,000 us-gaap_InterestPaidNet | 209,580,000 us-gaap_InterestPaidNet | 212,364,000 us-gaap_InterestPaidNet
Capital Lease Obligations [Member] |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed | 1,572 us-gaap_NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1 / us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis = us-gaap_CapitalLeaseObligationsMember | 4,178 us-gaap_NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1 / us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis = us-gaap_CapitalLeaseObligationsMember | 3,583 us-gaap_NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1 / us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis = us-gaap_CapitalLeaseObligationsMember
Notes Received from Property Sales [Member] |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |
Other Significant Noncash Transaction, Value of Consideration Received | 74,292 us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationReceived1 / us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis = cnx_NotesReceivedFromPropertySalesMember | 40,870 us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationReceived1 / us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis = cnx_NotesReceivedFromPropertySalesMember | 63,051 us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationReceived1 / us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis = cnx_NotesReceivedFromPropertySalesMember
Commercial Paper [Member] |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |
Other Significant Noncash Transaction, Value of Consideration Received |  | $ 6,236,000 us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationReceived1 / us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis = us-gaap_CommercialPaperMember |

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The amount of cash paid for interest during the period net of cash paid for interest that is capitalized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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- Definition The total amount of [all] liabilities that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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