DERIVATIVE FINANCIAL INSTRUMENTS - Gain (Loss) Recognized (Details) - Not designated as ASC 815 Hedges - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	$ 93,027	$ (34,963)
Derivative commodity contracts | Gain (loss) on commodity derivative financial instruments
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	95,863	(33,343)
Derivative interest rate swaps | Interest expense
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	$ (2,836)	$ (1,620)