INVENTORIES (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Inventory [Line Items]
Crude oil and feedstocks	$ 651,161,000	$ 642,388,000
Refined products and blendstocks	766,655,000	823,410,000
Warehouse stock and other	32,702,000	31,321,000
Total inventory	1,450,518,000	1,497,119,000
Excess of replacement value of inventory over LIFO carrying value	137,883	79,859
Titled Inventory [Member]
Inventory [Line Items]
Crude oil and feedstocks	424,649,000	384,441,000
Refined products and blendstocks	355,286,000	405,545,000
Warehouse stock and other	32,702,000	31,321,000
Total inventory	812,637,000	821,307,000
Inventory Supply and Offtake Arrangements [Member]
Inventory [Line Items]
Crude oil and feedstocks	226,512,000	257,947,000
Refined products and blendstocks	411,369,000	417,865,000
Warehouse stock and other	0	0
Total inventory	$ 637,881,000	$ 675,812,000