DEFERRED CHARGES AND OTHER ASSETS, NET (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred turnaround costs, net	$ 673,107	$ 560,403
Catalyst, net	124,290	131,019
Environmental credits	37,811	42,452
Linefill	19,485	19,485
Pension plan assets	9,694	9,593
Intangible assets, net	511	537
Other	6,950	16,435
Total deferred charges and other assets, net	871,848	779,924
Amortization expense	207,191	143,978	$ 105,547
Intangible Assets, Net [Abstract]
Intangible asset - gross	3,996	3,996
Accumulated amortization	(3,485)	(3,459)
Intangible assets - net	511	537
Indefinitely-Lived Precious Metal [Member]
Catalyst, net	$ 73,079	$ 73,967