SEGMENT INFORMATION - SCHEDULE OF UNALLOCATED MARK-TO-MARKET (GAINS) LOSSES ON COMMODITY DERIVATIVES (Details) - Commodities futures and options - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net losses (gains) on mark-to-market valuation of commodity derivative positions recognized in unallocated derivative losses (gains)	$ 6,429	$ (28,651)	$ (168,263)
Operating Segments
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative positions reclassified from unallocated to segment income	13,022	6,837	(98,884)
Non-designated Hedges
Segment Reporting Information [Line Items]
Net gains on mark-to-market valuation of commodity derivative positions recognized in income	$ (6,593)	$ (35,488)	$ (69,379)