CREDIT FACILITY AND LONG-TERM DEBT (Debt Maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Long-term Debt, Fiscal Year Maturity [Abstract]
2017	$ 16,066
2018	382,910
2019	10,072
2020	28,366
2021	0
Thereafter	1,225,000
Long-term Debt	1,662,414
Capital Lease Obligations [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Long-term Debt		$ 45,969
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] \| Delaware City Catalyst Lease - Short Term Bridge [Member]
Debt Instrument [Line Items]
Debt Instrument, Fee Amount	$ 3
Debt fixed interest rate	1.69%
Capital Lease Obligations [Member] \| Delaware City Catalyst Lease - Long Term Bridge [Member]
Debt Instrument [Line Items]
Debt Instrument, Fee Amount	$ 117
Debt fixed interest rate	1.69%
Capital Lease Obligations [Member] \| Toledo Catalyst Lease [Member]
Debt Instrument [Line Items]
Debt Instrument, Fee Amount	$ 178
Debt fixed interest rate	1.75%
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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. 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
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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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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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