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Acquisitions (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 7 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2016
Aug. 31, 2017
Jan. 31, 2017
Business Acquisition [Line Items]          
Proceeds from sale of oil and gas property and equipment   $ 140,324      
Line of credit facility amount outstanding   $ 115,000      
Affiliated Entity [Member]          
Business Acquisition [Line Items]          
Oil and natural gas properties acquired interest, percentage         87.00%
Eagle Ford Acquisition [Member]          
Business Acquisition [Line Items]          
Oil and natural gas properties acquired interest, percentage         5.80%
Oil and natural gas properties acquired, purchase price         $ 58,700
Line of credit facility amount outstanding         $ 6,600
Central Texas [Member]          
Business Acquisition [Line Items]          
Oil and natural gas properties acquired interest, percentage       40.00%  
Oil and natural gas properties acquired, purchase price       $ 2,700  
Barnett Shale [Member]          
Business Acquisition [Line Items]          
Proceeds from sale of oil and gas property and equipment $ 52,100   $ 52,100