INVENTORIES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Inventory [Line Items]
Crude oil and feedstocks	$ 1,271,675		$ 1,073,093
Refined products and blendstocks	1,420,262		1,342,294
Warehouse stock and other	100,610		98,866
Inventory, Gross	2,792,547		2,514,253
Lower of cost or market adjustment	(212,803)	$ 612,027	(300,456)	$ 595,988
Inventories	2,579,744		2,213,797
Operating Income (Loss)	(64,729)	31,761
Net income (loss)	32,407	(65,540)
Titled Inventory [Member]
Inventory [Line Items]
Crude oil and feedstocks	1,271,675		1,073,093
Refined products and blendstocks	1,069,309		1,030,817
Warehouse stock and other	100,610		98,866
Inventory, Gross	2,441,594		2,202,776
Lower of cost or market adjustment	(149,406)		(232,652)
Inventories	2,292,188		1,970,124
Inventory Supply and Offtake Arrangements [Member]
Inventory [Line Items]
Crude oil and feedstocks	0		0
Refined products and blendstocks	350,953		311,477
Warehouse stock and other	0		0
Inventory, Gross	350,953		311,477
Lower of cost or market adjustment	(63,397)		(67,804)
Inventories	287,556		$ 243,673
Scenario, Adjustment [Member]
Inventory [Line Items]
Operating Income (Loss)	$ (87,653)	$ (16,039)