INVENTORIES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Inventory [Line Items]
Crude oil and feedstocks	$ 1,159,842		$ 1,159,842			$ 1,073,093
Refined products and blendstocks	1,332,170		1,332,170			1,342,294
Warehouse stock and other	103,066		103,066			98,866
Inventory, Gross	2,595,078		2,595,078			2,514,253
Lower of cost or market adjustment	(54,801)	$ 763,122	(54,801)	$ 763,122	$ (212,803)	(300,456)	$ 612,027	$ 595,988
Inventories	2,540,277		2,540,277			2,213,797
Operating Income (Loss)	(392,187)	142,173	(456,916)	173,934
Net income (loss)	367,535	(205,376)	399,942	(270,916)
Titled Inventory [Member]
Inventory [Line Items]
Crude oil and feedstocks	1,159,842		1,159,842			1,073,093
Refined products and blendstocks	1,036,028		1,036,028			1,030,817
Warehouse stock and other	103,066		103,066			98,866
Inventory, Gross	2,298,936		2,298,936			2,202,776
Lower of cost or market adjustment	(11,751)		(11,751)			(232,652)
Inventories	2,287,185		2,287,185			1,970,124
Inventory Supply and Offtake Arrangements [Member]
Inventory [Line Items]
Crude oil and feedstocks	0		0			0
Refined products and blendstocks	296,142		296,142			311,477
Warehouse stock and other	0		0			0
Inventory, Gross	296,142		296,142			311,477
Lower of cost or market adjustment	(43,050)		(43,050)			(67,804)
Inventories	253,092		253,092			$ 243,673
Scenario, Adjustment [Member]
Inventory [Line Items]
Operating Income (Loss)	$ (158,002)	$ (151,095)	$ (245,655)	$ (167,134)