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Acquisitions and Dispositions Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2018
Jan. 03, 2018
Dec. 14, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 13, 2017
Business Acquisition [Line Items]            
Net gain on sale       $ 11,342 $ 3,996  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain       $ 623,663 $ 0  
Midstream Acquisition [Member]            
Business Acquisition [Line Items]            
Cash consideration transferred   $ 305,000 $ 305,000      
Fair value of previously held equity interest   799,033        
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain   $ 623,663        
Shallow Oil, Gas, and CBM Assets in Pennsylvania and West Virginia [Member]            
Business Acquisition [Line Items]            
Cash consideration received in sale of oil and gas assets $ 87,510          
Asset retirement obligations assumed 196,514          
Net gain on sale $ 4,751          
CNX Gathering LLC [Member]            
Business Acquisition [Line Items]            
Ownership percentage in equity method investment   50.00% 50.00% 50.00%   50.00%
CONE Midstream GP LLC [Member]            
Business Acquisition [Line Items]            
Ownership percentage by parent     100.00%