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Leases Operating Leases (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating Leased Assets [Line Items] |  |  |
Assets Subleased to a Third party | $ 31,059 cnx_AssetsSubleasedtoaThirdparty | $ 6,212 cnx_AssetsSubleasedtoaThirdparty |
Operating Leases, Rent Expense | 126,078 us-gaap_LeaseAndRentalExpense | 90,128 us-gaap_LeaseAndRentalExpense | 83,064 us-gaap_LeaseAndRentalExpense
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
Operating Leases, Future Minimum Payments Due, Current | 104,232 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent |  |
Operating Leases, Future Minimum Payments, Due in Two Years | 94,421 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears |  |
Operating Leases, Future Minimum Payments, Due in Three Years | 87,210 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears |  |
Operating Leases, Future Minimum Payments, Due in Four Years | 60,705 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears |  |
Operating Leases, Future Minimum Payments, Due in Five Years | 25,068 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears |  |
Operating Leases, Future Minimum Payments, Due Thereafter | 78,954 us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter |  |
Operating Leases, Future Minimum Payments Due | 450,590 us-gaap_OperatingLeasesFutureMinimumPaymentsDue |  |
Discontinued Operations [Member] |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
Operating Leases, Future Minimum Payments Due, Current | 8,561 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / us-gaap_SaleLeasebackTransactionDescriptionAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |
Operating Leases, Future Minimum Payments, Due in Two Years | 7,637 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / us-gaap_SaleLeasebackTransactionDescriptionAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |
Operating Leases, Future Minimum Payments, Due in Three Years | 4,496 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / us-gaap_SaleLeasebackTransactionDescriptionAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |
Operating Leases, Future Minimum Payments, Due in Four Years | 2,992 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears / us-gaap_SaleLeasebackTransactionDescriptionAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |
Operating Leases, Future Minimum Payments, Due in Five Years | 1,701 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears / us-gaap_SaleLeasebackTransactionDescriptionAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |
Operating Leases, Future Minimum Payments, Due Thereafter | 627 us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter / us-gaap_SaleLeasebackTransactionDescriptionAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |
Operating Leases, Future Minimum Payments Due | 26,014 us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_SaleLeasebackTransactionDescriptionAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |
333131 Mining Machinery and Equipment Manufacturing [Member] |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
Operating Leases, Future Minimum Payments Due, Current | 26,685 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / us-gaap_SaleLeasebackTransactionDescriptionAxis = naics_ZZ333131 |  |
Operating Leases, Future Minimum Payments, Due in Two Years | 26,685 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / us-gaap_SaleLeasebackTransactionDescriptionAxis = naics_ZZ333131 |  |
Operating Leases, Future Minimum Payments, Due in Three Years | 26,685 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / us-gaap_SaleLeasebackTransactionDescriptionAxis = naics_ZZ333131 |  |
Operating Leases, Future Minimum Payments, Due in Four Years | 26,685 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears / us-gaap_SaleLeasebackTransactionDescriptionAxis = naics_ZZ333131 |  |
Operating Leases, Future Minimum Payments, Due in Five Years | 13,343 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears / us-gaap_SaleLeasebackTransactionDescriptionAxis = naics_ZZ333131 |  |
Operating Leases, Future Minimum Payments, Due Thereafter | 0 us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter / us-gaap_SaleLeasebackTransactionDescriptionAxis = naics_ZZ333131 |  |
Operating Leases, Future Minimum Payments Due | $ 120,083 us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_SaleLeasebackTransactionDescriptionAxis = naics_ZZ333131 |  |

X
- Definition Assets Subleased to a Third party + References No definition available. + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments maturing in the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments maturing in the second fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments maturing after the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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