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Acquisitions and Dispositions - Narrative (Details)
a in Thousands
1 Months Ended 12 Months Ended
Sep. 28, 2020
USD ($)
shares
Aug. 31, 2018
USD ($)
a
May 02, 2018
USD ($)
well
Mar. 30, 2018
USD ($)
Jan. 03, 2018
USD ($)
Dec. 14, 2017
USD ($)
May 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
a
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]                    
Common stock outstanding (in shares) | shares               220,440,993 186,642,962  
Entity shares issued per acquiree share (in shares) | shares 0.88                  
Proved undeveloped acreage | a               43,713    
Proceeds from sale of assets               $ 48,322,000 $ 45,160,000 $ 511,767,000
Net gain (loss) on sale               21,224,000 35,563,000 157,015,000
Impairment of other intangibles               0 0 18,650,000
Gain on remeasurement of fair value of previously held equity interest               0 0 623,663,000
CNX Gathering                    
Business Acquisition [Line Items]                    
Ownership percentage in equity method investment           50.00%        
Customer Relationships                    
Business Acquisition [Line Items]                    
Impairment of other intangibles               0 $ 0 18,650,000
Ohio Utica Joint Venture Assets                    
Business Acquisition [Line Items]                    
Proved undeveloped acreage | a   26                
Proceeds from sale of assets   $ 381,124,000                
Net gain (loss) on sale   $ 130,710,000                
Asset Exchange Agreement with HG Energy                    
Business Acquisition [Line Items]                    
Net gain (loss) on sale     $ 286,000              
Cash proceeds from Asset Exchange Agreement     $ 7,000,000              
Number of wells added to existing commitment | well     40              
Shallow Oil, Gas, and CBM Assets in Pennsylvania and West Virginia                    
Business Acquisition [Line Items]                    
Net gain (loss) on sale       $ 4,227,000            
Cash consideration received in sale of oil and gas assets       89,921,000            
Asset retirement obligations assumed       $ 196,514,000            
CNXM                    
Business Acquisition [Line Items]                    
Common stock outstanding (in shares) | shares 42,107,071                  
CNXM | Public Unitholders                    
Business Acquisition [Line Items]                    
Ownership percentage in equity method investment 46.90%                  
CNXM | CNX                    
Business Acquisition [Line Items]                    
Ownership percentage in equity method investment 53.10%                  
CNXM CNX Midstream GP LLC CNX Resources Holding LLC Merger Agreements                    
Business Acquisition [Line Items]                    
Number of shares issued in acquisition | shares 37,054,223                  
Cash consideration transferred $ 384,623,000                  
Transaction costs               $ 11,271,000    
Midstream                    
Business Acquisition [Line Items]                    
Cash consideration transferred         $ 305,000,000          
Fair value of previously held equity interest         $ 799,033,000 $ 799,033,000        
Gain on remeasurement of fair value of previously held equity interest           $ 623,663,000        
Midstream | Customer Relationships                    
Business Acquisition [Line Items]                    
Impairment of other intangibles             $ 18,650,000     $ 18,650,000