ACQUISITIONS (Purchase Price) (Details) - Torrance Refinery [Member] - USD ($)		12 Months Ended
	Jul. 01, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Gross purchase price	$ 537,500,000
Working capital	450,582,000
Post close purchase price adjustments	(16,150,000)
Total consideration	971,932,000
Payment to Acquire Business	$ 521,350,000	$ 0	$ 0	$ 971,932,000