DEFERRED CHARGES AND OTHER ASSETS, NET (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred turnaround costs, net	$ 598,200	$ 722,700
Catalyst, net	155,200	132,700
Environmental credits	39,600	37,800
Linefill	27,400	19,500
Pension plan assets	21,200	10,300
Intangible assets, net	500	500
Other	20,600	6,500
Total deferred charges and other assets, net	862,700	930,000
Accelerated Amortization, Deferred Turnaround Costs	56,200
Amortization expense	315,700	256,800	$ 207,200
Intangible Assets, Net [Abstract]
Intangible assets - gross	4,000	4,000
Accumulated amortization	(3,500)	(3,500)
Intangible assets - net	500	500
Indefinitely-Lived Precious Metal [Member]
Catalyst, net	$ 115,200	$ 74,500