Annual report pursuant to Section 13 and 15(d)

SUPPLEMENTAL OIL AND GAS INFORMATION (UNAUDITED) - Average Sales Prices (Details)

v3.20.4
SUPPLEMENTAL OIL AND GAS INFORMATION (UNAUDITED) - Average Sales Prices (Details)
12 Months Ended
Dec. 31, 2020
$ / Mcf
$ / bbl
Dec. 31, 2019
$ / bbl
$ / Mcf
Dec. 31, 2018
$ / bbl
$ / Mcf
Natural Gas      
Reserve Quantities [Line Items]      
Average sale price (in dollars per volume unit) | $ / Mcf 1.61 2.12 4.50
Oil      
Reserve Quantities [Line Items]      
Average sale price (in dollars per volume unit) | $ / bbl 32.69 50.53 61.23