Supplemental Gas Data Capitalized Costs (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]
Proven properties		$ 1,670,404
Proved Oil and Gas Property, Successful Effort Method	1,768,007	1,670,404
Unproven properties		1,463,406
Unproved Oil and Gas Property, Successful Effort Method	1,540,835	1,463,406
Drilling Cost	2,798,394cnx_DrillingCost	1,937,336cnx_DrillingCost
Wells and related equipment	716,748	688,548
Gathering assets	1,088,238	1,058,008
Oil and Gas Reclamation Liability, Noncurrent	111,227	113,481
Total Property, Plant and Equipment	8,023,449	6,931,183
Accumulated Depreciation, Depletion and Amortization	(1,515,983)	(1,187,409)
Net Capitalized Costs	$ 6,507,466	$ 5,743,774

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Amount of accumulated depreciation, depletion, amortization and valuation allowance relating to oil and gas producing activities.

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The sum of capitalized costs relating to oil and gas producing activities before accounting for accumulated depreciation.

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Net amount of capitalized costs relating to oil and gas producing activities.

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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.

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Capitalized costs incurred for support equipment and facilities used in oil and gas producing activities (such as seismic equipment, drilling equipment, construction and grading equipment, vehicles, repair shops, warehouses, supply points, camps, and division, district, or field offices).

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Capitalized costs of unproved properties incurred for any combination mineral interests acquisitions and other costs not previously disclosed within this table.

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Capitalized costs which include those incurred to (1) to drill and equip those exploratory wells and exploratory-type stratigraphic test wells that have found proved reserves and (2) obtain access to proved reserves and provide facilities for extracting, treating, gathering, storing the oil and gas, including the drilling and equipping of development wells and development-type stratigraphic wells and service wells.

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Amount of a reclamation liability that is associated with a legal obligation for the closure and reclamation of oil and gas properties.

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Oil and Gas properties with proved reserves under the successful effort method.

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Oil and Gas properties with unproved reserves under the successful effort method.

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