INVENTORIES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Inventory [Line Items]
Excess of Replacement or Current Costs over Stated LIFO Value	$ 12,037		$ 12,037
Crude oil and feedstocks	1,055,654		1,055,654		$ 1,073,093
Refined products and blendstocks	1,399,975		1,399,975		1,342,294
Warehouse stock and other	105,477		105,477		98,866
Inventory, Gross	2,561,106		2,561,106		2,514,253
Lower of cost or market adjustment	0	$ 498,045	0	$ 498,045	(300,456)	$ 763,122	$ 595,988
Inventories	2,561,106		2,561,106		2,213,797
Operating Income (Loss)	(253,827)	(550,687)	(710,743)	(376,753)
Net income	224,698	526,080	624,640	255,164
Titled Inventory [Member]
Inventory [Line Items]
Crude oil and feedstocks	1,055,654		1,055,654		1,073,093
Refined products and blendstocks	1,060,841		1,060,841		1,030,817
Warehouse stock and other	105,477		105,477		98,866
Inventory, Gross	2,221,972		2,221,972		2,202,776
Lower of cost or market adjustment	0		0		(232,652)
Inventories	2,221,972		2,221,972		1,970,124
Inventory Supply and Offtake Arrangements [Member]
Inventory [Line Items]
Crude oil and feedstocks	0		0		0
Refined products and blendstocks	339,134		339,134		311,477
Warehouse stock and other	0		0		0
Inventory, Gross	339,134		339,134		311,477
Lower of cost or market adjustment	0		0		(67,804)
Inventories	339,134		339,134		$ 243,673
Scenario, Adjustment [Member]
Inventory [Line Items]
Operating Income (Loss)	$ (54,801)	$ (265,077)	$ (300,456)	$ (97,943)