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Fair Value Measurements - Hierarchy of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Assets:    
Permian Basin Sale Contingent Consideration $ 32,860  
Commodity derivative instruments   $ 467
Total assets 32,860 467
Liabilities:    
Commodity derivative instruments 381,649 94,558
Total liabilities 381,649 94,558
Level 1    
Assets:    
Permian Basin Sale Contingent Consideration 0  
Commodity derivative instruments   0
Total assets 0 0
Liabilities:    
Commodity derivative instruments 0 0
Total liabilities 0 0
Level 2    
Assets:    
Permian Basin Sale Contingent Consideration 32,860  
Commodity derivative instruments   467
Total assets 32,860 467
Liabilities:    
Commodity derivative instruments 381,649 94,558
Total liabilities 381,649 94,558
Level 3    
Assets:    
Permian Basin Sale Contingent Consideration 0  
Commodity derivative instruments   0
Total assets 0 0
Liabilities:    
Commodity derivative instruments 0 0
Total liabilities $ 0 $ 0