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Acquisitions and Dispositions Pro Forma Financial Information (Details) - Midstream $ / shares in Units, $ in Thousands | 12 Months Ended
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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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