INVENTORIES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2015	Dec. 31, 2014
Inventory [Line Items]
Crude oil and feedstocks	$ 943,988		$ 943,988			$ 979,878
Refined products and blendstocks	886,048		886,048			775,767
Warehouse stock and other	39,322		39,322			36,726
Inventory, Gross	1,869,358		1,869,358			1,792,371
Lower of cost or market reserve	(562,944)		(562,944)		$ 668,902	(690,110)
Inventories	1,306,414		1,306,414			1,102,261
Income (loss) from operations	273,796	$ 87,850	446,206	$ 348,057
Net income	158,460	$ 45,836	261,579	$ 229,108
Titled Inventory [Member]
Inventory [Line Items]
Crude oil and feedstocks	885,461		885,461			918,756
Refined products and blendstocks	536,831		536,831			520,308
Warehouse stock and other	39,322		39,322			36,726
Inventory, Gross	1,461,614		1,461,614			1,475,790
Lower of cost or market reserve	(470,241)		(470,241)			(609,774)
Inventories	991,373		991,373			866,016
Inventory Supply and Offtake Arrangements [Member]
Inventory [Line Items]
Crude oil and feedstocks	58,527		58,527			61,122
Refined products and blendstocks	349,217		349,217			255,459
Warehouse stock and other	0		0			0
Inventory, Gross	407,744		407,744			316,581
Lower of cost or market reserve	(92,703)		(92,703)			(80,336)
Inventories	315,041		315,041			$ 236,245
Scenario, Adjustment [Member]
Inventory [Line Items]
Income (loss) from operations	105,958		127,166
Net income	$ 63,363		$ 76,045