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Acquisitions and Dispositions Pro Forma Financial Information (Details) - Midstream Acquisition [Member] $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) $ / shares
Business Acquisition [Line Items]
Pro Forma Total Revenue and Other Operating Income	$ 344,637
Pro Forma Net Loss from Continuing Operations	(57,810)
Less: Pro Forma Net income Attributable to Noncontrolling Interests	19,414
Pro Forma Net Loss from Continuing Operations Attributable to CNX	$ (77,224)
Pro Forma Loss per Share from Continuing Operations (Basic) (usd per share) | $ / shares	$ (0.34)
Pro Forma Loss per Share from Continuing Operations (Diluted) (usd per share) | $ / shares	$ (0.34)

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- Definition

Business Acquisition, Pro Forma Income (Loss), Attributable to Non-Controlling Interests

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- Definition

Business Acquisition, Pro Forma Income (Loss), From Continuing Operations, Attributable to Parent

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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