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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax $ 177,386 $ 288,631
Concentration Risk, Percentage 10.00%  
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties $ 1,310,008 1,201,296
Unproved oil and gas properties 28,090 41,201
Furniture, fixtures, and other equipment 5,275 5,220
Less - Accumulated depreciation, depletion, and amortization (801,279) (380,728)
Property, Plant and Equipment, Net 542,094 866,989
Accounts Payable and Accrued Liabilities [Abstract]    
Trade accounts payable 15,930 26,121
Accrued operating expenses 2,491 3,873
Accrued payroll costs 3,771 4,601
Asset retirement obligation - current portion 441 392
Accrued taxes 1,819 1,413
Accrued Professional Fees, Current 150 109
Other payables 2,389 2,834
Total accounts payable and accrued liabilities $ 26,991 $ 39,343
Kinder Morgan Concentration Risk [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Concentration Risk, Percentage 19.00% 31.00%
Plains Marketing Concentration Risk [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Concentration Risk, Percentage 17.00% 14.00%
Twin Eagle Concentration Risk [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Concentration Risk, Percentage 17.00% 13.00%
Shell Trading Concentration Risk [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Concentration Risk, Percentage   11.00%
Trafigura US    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Concentration Risk, Percentage 13.00%  
Oil sales [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax $ 57,651 $ 92,833
Natural gas sales [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax 105,234 170,558
NGL sales [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax $ 14,500 $ 25,241