INVENTORIES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Inventory [Line Items]
Crude oil and feedstocks	$ 1,086,000		$ 1,086,000			$ 1,044,800
Refined products and blendstocks	1,300,800		1,300,800			1,361,700
Warehouse stock and other	118,400		118,400			109,400
Inventory, Gross	2,505,200		2,505,200			2,515,900
Lower of cost or market adjustment	(374,800)		(374,800)			(651,800)		$ 300,500
Total inventories	2,130,400		2,130,400			1,864,100
Excess of Replacement or Current Costs over Stated LIFO Value		$ 12,000		$ 12,000
Income (Loss) from Operations	107,800	253,800	417,700	710,700
Scenario, Adjustment [Member]
Inventory [Line Items]
Lower of cost or market adjustment	(374,800)	0	(374,800)	0	$ (327,800)	(651,800)	$ (54,800)
Income (Loss) from Operations	(47,000)	$ 54,800	277,000	$ 300,500
Titled Inventory [Member]
Inventory [Line Items]
Crude oil and feedstocks	1,065,600		1,065,600			1,044,800
Refined products and blendstocks	1,034,000		1,034,000			1,026,900
Warehouse stock and other	118,400		118,400			109,400
Inventory, Gross	2,218,000		2,218,000			2,181,100
Lower of cost or market adjustment	(292,400)		(292,400)			(557,200)
Total inventories	1,925,600		1,925,600			1,623,900
Inventory Supply and Offtake Arrangements [Member]
Inventory [Line Items]
Crude oil and feedstocks	20,400		20,400			0
Refined products and blendstocks	266,800		266,800			334,800
Warehouse stock and other	0		0			0
Inventory, Gross	287,200		287,200			334,800
Lower of cost or market adjustment	(82,400)		(82,400)			(94,600)
Total inventories	$ 204,800		$ 204,800			$ 240,200