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Earnings Per Share - Narrative (Details) - $ / shares | Sep. 28, 2020 | Apr. 30, 2020
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Convertible Debt | Convertible Senior Notes Due 2026 |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |
Conversion price (in usd per share) |  | $ 12.84
CNXM, CNX Midstream GP LLC, CNX Resources Holding LLC Merger Agreement |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |
Entity shares issued per acquiree share (in shares) | 0.88 |

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