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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