Annual report pursuant to Section 13 and 15(d)

Other (Details)

v3.10.0.1
Other (Details)
 1 Months Ended 12 Months Ended
Jan. 31, 2019
bbl / d
Aug. 31, 2018
bbl / d
Mar. 31, 2018
Dec. 31, 2018
contract
Operating Leases And Other Property Plant And Equipment [Line Items]        
Agreement period     2 years  
Long-term delivery commitment, volume required   15,000    
Subsequent Event        
Operating Leases And Other Property Plant And Equipment [Line Items]        
Long-term delivery commitment, volume required 10,000      
Horizontal Drilling Rig        
Operating Leases And Other Property Plant And Equipment [Line Items]        
Number of contracts | contract       5