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Earnings Per Share - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 28, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Antidilutive securities excluded from the computation of diluted earnings per share (in shares) |  | 7,198,202 | 3,776,724 | 7,198,202 | 3,775,807
Long-term equity-based compensation expense |  |  | $ 19,654 |  | $ 19,654
Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Accelerated vesting of equity instruments (in shares) |  |  |  |  | 473,126
Performance Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Accelerated vesting of equity instruments (in shares) |  |  |  |  | 903,100
SEAM |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Ownership percentage in equity method investment |  |  | 25.00% |  | 25.00%
Convertible Debt Securities |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Antidilutive securities excluded from the computation of diluted earnings per share (in shares) |  | 32,242,975 |  | 32,242,975 |
CNXM, CNX Midstream GP LLC, CNX Resources Holding LLC Merger Agreement |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Entity shares issued per acquiree share (in shares) | 0.88 |  |  |  |

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