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Acquisitions and Dispositions Pro Forma Financial Information (Details) - Midstream $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares
Business Acquisition [Line Items]
Pro Forma Total Revenue and Other Operating Income	$ 1,553,078
Pro Forma Net Income from Continuing Operations	427,381
Less: Pro Forma Net Income Attributable to Noncontrolling Interests	74,251
Pro Forma Net Income from Continuing Operations Attributable to CNX	$ 353,130
Pro Forma Income(Loss) per Share from Continuing Operations (Basic) (in usd per share) | $ / shares	$ 1.33
Pro Forma Income(Loss) per Share from Continuing Operations (Diluted) (in usd per share) | $ / shares	$ 1.33

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- Definition

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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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
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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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

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