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Stock-Based Compensation - Restricted and Performance Stock Unit Rollforward (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Restricted Stock Units    
Number of Shares    
Beginning nonvested balance (in shares) 1,033,200  
Granted (in shares) 1,251,065  
RSUs granted in conversion, as a result of the CNXM Merger (in shares) 204,619  
Vested (in shares) (577,834)  
Forfeited (in shares) (39,923)  
Ending nonvested balance (in shares) 1,871,127 1,033,200
Weighted Average Grant Date Fair Value    
Beginning nonvested balance (in usd per share) $ 10.10 $ 11.71
Granted (in usd per share) 8.49  
RSUs granted in conversion, as a result of the CNXM Merger (in usd per share) 18.01  
Vested (in usd per share) 10.95  
Forfeited (in usd per share) 9.65  
Ending nonvested balance (in usd per share) $ 10.10 $ 11.71
Performance Share Units    
Number of Shares    
Beginning nonvested balance (in shares) 1,400,836  
Granted (in shares) 660,634  
PSUs issued (in shares) 112,158  
Vested (in shares) (274,716)  
Forfeited (in shares) (131,474)  
Ending nonvested balance (in shares) 1,767,438 1,400,836
Weighted Average Grant Date Fair Value    
Beginning nonvested balance (in usd per share) $ 13.85 $ 18.91
Granted (in usd per share) 5.79  
PSUs issued (in usd per share) 20.39  
Vested (in usd per share) 20.82  
Forfeited (in usd per share) 18.37  
Ending nonvested balance (in usd per share) $ 13.85 $ 18.91