Annual report pursuant to Section 13 and 15(d)

Supplemental Information on Oil and Natural Gas Properties (Unaudited) (Narrative) (Details)

v3.19.3.a.u2
Supplemental Information on Oil and Natural Gas Properties (Unaudited) (Narrative) (Details)
MMBoe in Thousands, MBoe in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
well
MBoe
MMBoe
Dec. 31, 2019
MBoe
Dec. 31, 2019
MBoe
Dec. 31, 2019
MBoe
MMBoe
Dec. 31, 2018
well
MBoe
Dec. 31, 2017
well
MBoe
Dec. 31, 2019
MMBoe
Dec. 31, 2018
MMBoe
Dec. 31, 2016
MBoe
Reserve Quantities [Line Items]                  
Proved developed and undeveloped reserve, net (energy) 540,012 540,012 540,012 540,012 238,508 136,974 540,000 238,500 91,580
Proved developed and proved undeveloped reserves, percentage change between periods   126.00%     74.00% 50.00%      
Sale of reserves in place     32,456 32,500 0 0      
Revisions to previous estimates | MBoe         (11,086) (4,115)      
Permian Basin                  
Reserve Quantities [Line Items]                  
Proved developed and undeveloped reserve period increase (decrease) 386,300       124,600 57,900      
Number of wells drilled during the period 61       70 49      
Number of wells drilled during the period, net 53.7       57.5 38.2      
Revisions to previous estimates       (37,216) 2,000        
Reclassifications due to changes in development plan | MBoe     (9,800)   (9,100)        
Removal of proved undeveloped locations         19 13