COMMODITY DERIVATIVE INSTRUMENTS - Schedule of Derivative Instruments (Details) bbl in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) $ / bbl bbl	Dec. 31, 2019 USD ($) $ / bbl bbl
Derivative [Line Items]
Fair Value	$ 805,796	$ (375,850)
Swap
Derivative [Line Items]
Weighted Average Strike Price (in usd per barrel) | $ / bbl	19.60	40.88
Remaining Volume (Barrels) | bbl	50	130
Fair Value	$ (968,200)	$ 539,800
Swap
Derivative [Line Items]
Weighted Average Strike Price (in usd per barrel) | $ / bbl	41.68	81.19
Remaining Volume (Barrels) | bbl	50	130
Fair Value	$ 1,686,216	$ (673,428)
Futures
Derivative [Line Items]
Weighted Average Strike Price (in usd per barrel) | $ / bbl	42.06	84.53
Remaining Volume (Barrels) | bbl	40	105
Fair Value	$ 87,780	$ (242,222)