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Derivatives - Fair Value of Derivative Contracts (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Derivatives, Fair Value  
Derivative assets $ 114
Total net derivative contracts 114
Derivative contracts - current  
Derivatives, Fair Value  
Derivative assets 114
Oil price swaps | Derivative contracts - current  
Derivatives, Fair Value  
Derivative assets 114
Natural gas price swaps | Derivative contracts - current  
Derivatives, Fair Value  
Derivative assets $ 0