INVENTORIES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Inventory [Line Items]
Crude oil and feedstocks	$ 1,254,000		$ 1,254,000			$ 1,074,100
Refined products and blendstocks	1,333,500		1,333,500			1,328,900
Warehouse stock and other	135,700		135,700			120,800
Inventory, Gross	2,723,200		2,723,200			2,523,800
Lower of cost or market adjustment	(1,103,000)		(1,103,000)			(401,600)
Total inventories	1,620,200		1,620,200			2,122,200
Income (Loss) from Operations	570,900	$ (25,600)	(843,500)	$ 309,900
Scenario, Adjustment [Member]
Inventory [Line Items]
Lower of cost or market adjustment	(1,103,000)	(327,800)	(1,103,000)	(327,800)	$ (1,687,200)	(401,600)	$ (145,800)	$ (651,800)
Income (Loss) from Operations	584,200	$ 182,000	(701,400)	$ 324,000
Titled Inventory [Member]
Inventory [Line Items]
Crude oil and feedstocks	1,254,000		1,254,000			1,071,400
Refined products and blendstocks	1,056,300		1,056,300			976,000
Warehouse stock and other	135,700		135,700			120,800
Inventory, Gross	2,446,000		2,446,000			2,168,200
Lower of cost or market adjustment	(965,700)		(965,700)			(324,800)
Total inventories	1,480,300		1,480,300			1,843,400
Inventory Supply and Offtake Arrangements [Member]
Inventory [Line Items]
Crude oil and feedstocks	0		0			2,700
Refined products and blendstocks	277,200		277,200			352,900
Warehouse stock and other	0		0			0
Inventory, Gross	277,200		277,200			355,600
Lower of cost or market adjustment	(137,300)		(137,300)			(76,800)
Total inventories	$ 139,900		$ 139,900			$ 278,800