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Related Party Transactions (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
party
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Related Party Transaction [Line Items]      
Total joint interest billing receivable (less than 1%) 1.00%    
Officer      
Related Party Transaction [Line Items]      
Number of related parties | party 2    
Joint interest billing receivables $ 89    
Mr. Goodson | Officer      
Related Party Transaction [Line Items]      
Proceeds from affiliates (107) $ (15) $ (45)
Mr. Green | Officer      
Related Party Transaction [Line Items]      
Payments of distributions to related parties $ 41 $ 25 $ 30