SUPPLEMENTARY INFORMATION ON OIL AND NATURAL GAS EXPLORATION, DEVELOPMENT - Reserve Quantity Information (Details)	12 Months Ended
	Dec. 31, 2019 bbl MBbls	Dec. 31, 2019 bbl MBbls	Dec. 31, 2018 bbl MBbls	Dec. 31, 2017 bbl MBbls
Oil
Reserve Quantities [Line Items]
Beginning balance	21,205,036		7,171,339
Extensions and discoveries	856,838	1,500,000	15,881,727
Purchase of reserves			1,883,047
Revisions of previous estimates	(15,596,115)	29,800,000	(2,641,353)
Production	(1,130,855)	(21,500,000)	(1,089,724)
Ending balance	5,334,904		21,205,036
Proved Developed Reserves	5,334,904	5,334,904	6,278,036	2,531,397
Proved Undeveloped Reserves	0	0	14,927,000	4,639,942
Natural Gas
Reserve Quantities [Line Items]
Beginning balance | MBbls		78,749,613	16,059,926
Extensions and discoveries | MBbls		2,477,061	38,957,588
Purchase of reserves | MBbls			8,897,115
Revisions of previous estimates | MBbls		(48,718,235)	17,690,723
Production | MBbls		(3,063,927)	(2,855,739)
Ending balance | MBbls		29,444,512	78,749,613
Proved Developed Reserves | MBbls	29,444,512	29,444,512	27,046,195	6,594,446
Proved Undeveloped Reserves | MBbls	0	0	51,703,418	9,465,480
Natural Gas Liquids
Reserve Quantities [Line Items]
Beginning balance	8,376,551		1,604,570
Extensions and discoveries	190,203		4,565,994
Purchase of reserves			682,964
Revisions of previous estimates	(6,067,700)		1,769,448
Production	(220,832)		(246,425)
Ending balance	2,278,222		8,376,551
Proved Developed Reserves	2,278,222	2,278,222	2,653,908	644,102
Proved Undeveloped Reserves	0	0	5,722,643	960,468