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Earnings Per Share - Narrative (Details) - $ / shares | Sep. 28, 2020 | Dec. 31, 2020 | Apr. 30, 2020
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Entity shares issued per acquiree share (in shares) | 0.88 |  |
Convertible Debt | Convertible 2.25% Senior Notes Due 2026 |  |  |
Business Acquisition [Line Items] |  |  |
Initial conversion price (in usd per share) |  | $ 12.84 | $ 12.84
CNXM, CNX Midstream GP LLC, CNX Resources Holding LLC Merger Agreement |  |  |
Business Acquisition [Line Items] |  |  |
Entity shares issued per acquiree share (in shares) | 0.88 |  |

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