CREDIT FACILITY AND LONG-TERM DEBT (Debt Maturities) (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]
2017	$ 9,798
2018	4,941
2019	381,230
2020	670,867
2021	35,000
Thereafter	500,000
Long-term Debt	1,601,836
Capital Lease Obligations [Member] \| Paulsboro Catalyst Lease [Member]
Debt Instrument [Line Items]
Debt Instrument, Fee Amount	$ 140
Debt fixed interest rate	2.20%
Capital Lease Obligations [Member] \| Delaware City Catalyst Lease [Member]
Debt Instrument [Line Items]
Debt Instrument, Fee Amount	$ 210
Debt fixed interest rate	1.95%
Capital Lease Obligations [Member] \| Delaware City Catalyst Lease - Palladium [Member]
Debt Instrument [Line Items]
Debt Instrument, Fee Amount	$ 30
Debt fixed interest rate	2.05%
Capital Lease Obligations [Member] \| Toledo Catalyst Lease [Member]
Debt Instrument [Line Items]
Debt Instrument, Fee Amount	$ 331
Debt fixed interest rate	1.99%
Capital Lease Obligations [Member] \| Chalmette Catalyst Lease [Member]
Debt Instrument [Line Items]
Debt Instrument, Fee Amount	$ 185
Debt fixed interest rate	3.85%
Capital Lease Obligations [Member] \| Chalmette Catalyst Lease 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fee Amount	$ 171
Debt fixed interest rate	2.20%
Capital Lease Obligations [Member] \| Torrance Catalyst Lease [Member]
Debt Instrument [Line Items]
Debt Instrument, Fee Amount	$ 143
Debt fixed interest rate	1.78%

Amount of the fee that accompanies borrowing money under the debt instrument.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(b))
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Contractual interest rate for funds borrowed, under the debt agreement.

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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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-Subparagraph (SX 210.9-03.16)
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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