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Derivatives - Fair Value of Derivative Contracts (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Derivatives, Fair Value    
Derivative assets   $ 114
Derivative liabilities $ 3,915  
Total net derivative contracts (3,915) 114
Current assets    
Derivatives, Fair Value    
Derivative assets   114
Current liabilities    
Derivatives, Fair Value    
Derivative liabilities 3,915  
Oil price swaps | Current assets    
Derivatives, Fair Value    
Derivative assets 0 114
Natural gas price swaps | Current liabilities    
Derivatives, Fair Value    
Derivative liabilities (3,088) 0
Natural gas price swaps | Noncurrent Liabilities    
Derivatives, Fair Value    
Derivative liabilities $ (827) $ 0