Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Narrative) (Details)

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Commitments and Contingencies (Narrative) (Details)
1 Months Ended 12 Months Ended
Jul. 31, 2019
bbl / d
Jun. 30, 2019
bbl / d
Jan. 31, 2019
bbl / d
Aug. 30, 2018
bbl / d
Mar. 31, 2018
Dec. 31, 2019
contract
Operating Leases And Other Property Plant And Equipment [Line Items]            
Agreement period         2 years  
Long-term delivery commitment, volume required | bbl / d 5,000 10,000 10,000 15,000    
Horizontal Drilling Rig            
Operating Leases And Other Property Plant And Equipment [Line Items]            
Number of contracts | contract           9