DEFERRED CHARGES AND OTHER ASSETS, NET (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	$ 9,593	$ 9,440
Deferred turnaround costs, net	560,403	302,919
Catalyst, net	131,019	114,788
Linefill	19,485	19,485
Environmental Credits	42,452	51,636
Intangible assets, net	537	577
Other	18,694	7,751
Total deferred charges and other assets, net	782,183	506,596
Amortization expense	143,978	105,547	$ 102,636
Intangible Assets, Net [Abstract]
Gross amount	3,996	3,996
Accumulated amortization	(3,459)	(3,419)
Net amount	$ 537	$ 577