FAIR VALUE MEASUREMENTS (Fair Value and Carrying Value of Debt) (Details)		Dec. 31, 2017 USD ($)		Oct. 05, 2017 lease	Dec. 31, 2016 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt		$ 1,662,414,000
Long term loan		1,662,414,000			$ 1,601,836,000
Long-term debt, Fair value		1,723,460,000			1,625,868,000
Less - Current debt (c)		(10,987,000)			0
Less - Current maturities, Fair value		(10,987,000)			0
Unamortized Debt Issuance Expense		(25,178,000)			(25,277,000)
Long-term debt		1,626,249,000			1,576,559,000
Long-term debt, Fair value		1,712,473,000			1,625,868,000
Number of leases | lease				2
2025 Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	[1]	725,000,000			0
Long-term debt, Fair value	[1]	763,945,000			0
2023 Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	[1],[2]	500,000,000			500,000,000
Long-term debt, Fair value	[1],[2]	522,101,000			498,801,000
Senior secured notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	[1]	0			670,867,000
Long-term debt, Fair value	[1]	0			696,098,000
Capital Lease Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt					45,969,000
Notes Payable to Banks [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt		28,366,000			35,000,000
Catalyst lease [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	[3]				45,969,000
Long-term debt, Fair value	[3]	59,048,000			45,969,000
Revolving Credit Facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Line of Credit	[4]				350,000,000
Lines of Credit, Fair Value Disclosure	[4]	350,000,000			350,000,000
Revolving Credit Facility [Member] | Line of Credit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Line of Credit		350,000,000	[4]		350,000,000
Catalyst lease [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Capital Lease Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	[3]	59,048,000
PBF Rail Logistics Company LLC [Member] | Notes Payable to Banks [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	[4]	28,366,000			35,000,000
Long-term debt, Fair value	[4]	$ 28,366,000			$ 35,000,000

[1] (a) The estimated fair value, categorized as a Level 2 measurement, was calculated based on the present value of future expected payments utilizing implied current market interest rates based on quoted prices of the Senior Notes and Senior Secured Notes.

[2] (d) As discussed in “Note 8 - Credit Facility and Debt”, these notes became unsecured following the Collateral Fall-Away Event on May 30, 2017.

[3] (c) Catalyst leases are valued using a market approach based upon commodity prices for similar instruments quoted in active markets and are categorized as a Level 2 measurement. The Company has elected the fair value option for accounting for its catalyst lease repurchase obligations as the Company’s liability is directly impacted by the change in fair value of the underlying catalyst. On October 5, 2017 Delaware City Refining entered into two platinum bridge leases which will expire in 2018. The leases are payable at maturity and will not be renewed. The total outstanding balance related to these bridge leases as of December 31, 2017 was $10,987 and is included in Current debt on our Consolidated balance sheet.

[4] (b) The estimated fair value approximates carrying value, categorized as a Level 2 measurement, as these borrowings bear interest based upon short-term floating market interest rates.