Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment, Net (Narrative) (Details)

v3.20.2
Property and Equipment, Net (Narrative) (Details)
 3 Months Ended 6 Months Ended
Sep. 30, 2020
$ / bbl
Jun. 30, 2020
USD ($)
$ / bbl
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
$ / bbl
Mar. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Property, Plant and Equipment [Abstract]              
Internal costs capitalized   $ 8,900,000   $ 8,400,000   $ 16,400,000 $ 19,100,000
Interest costs capitalized   20,900,000   18,700,000   44,900,000 38,600,000
Amount transferred from unevaluated properties into evaluated properties   43,900,000       224,400,000  
Property, Plant and Equipment [Line Items]              
Impairment of evaluated oil and gas properties   $ 1,276,518,000 $ 0 $ 0 $ 0 $ 1,276,518,000 $ 0
Beginning of period 12-Month Average Realized Price ($/Bbl) | $ / bbl   54.63   54.58      
Forecast              
Property, Plant and Equipment [Line Items]              
Beginning of period 12-Month Average Realized Price ($/Bbl) | $ / bbl 43.45