CREDIT FACILITY AND LONG-TERM DEBT (Details) (USD $)	12 Months Ended			1 Months Ended				1 Months Ended									0 Months Ended			0 Months Ended	12 Months Ended	0 Months Ended		12 Months Ended		0 Months Ended	1 Months Ended	0 Months Ended	1 Months Ended	0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Oct. 31, 2012 Line of Credit [Member] Revolving Loan [Member]	Dec. 31, 2013 Line of Credit [Member] Revolving Loan [Member]	Nov. 30, 2013 Line of Credit [Member] Revolving Loan [Member]	Dec. 31, 2012 Line of Credit [Member] Revolving Loan [Member]	Oct. 31, 2012 Line of Credit [Member] Revolving Loan [Member] Minimum [Member]	Oct. 31, 2012 Line of Credit [Member] Revolving Loan [Member] Maximum [Member]	Oct. 31, 2012 Line of Credit [Member] Revolving Loan [Member] Base Rate [Member] Minimum [Member]	Oct. 31, 2012 Line of Credit [Member] Revolving Loan [Member] Base Rate [Member] Maximum [Member]	Oct. 31, 2012 Line of Credit [Member] Revolving Loan [Member] LIBOR [Member] Minimum [Member]	Oct. 31, 2012 Line of Credit [Member] Revolving Loan [Member] LIBOR [Member] Maximum [Member]	Oct. 31, 2012 Line of Credit [Member] Letter of Credit [Member]	Dec. 31, 2013 Line of Credit [Member] Standby Letters of Credit [Member]	Dec. 31, 2012 Line of Credit [Member] Standby Letters of Credit [Member]	Feb. 09, 2012 Senior Secured Notes [Member]	Feb. 09, 2012 Senior Secured Notes [Member] Board of Directors Chairman [Member]	Oct. 17, 2013 Financing Arrangements [Member]	Aug. 05, 2011 Financing Arrangements [Member] Delaware City Construction Financing [Member]	Dec. 31, 2012 Financing Arrangements [Member] Delaware City Construction Financing [Member]	Dec. 05, 2013 Financing Arrangements [Member] Paulsboro Catalyst Lease [Member]	Jan. 06, 2012 Financing Arrangements [Member] Paulsboro Catalyst Lease [Member]	Dec. 31, 2013 Financing Arrangements [Member] Paulsboro Catalyst Lease [Member]	Dec. 31, 2012 Financing Arrangements [Member] Paulsboro Catalyst Lease [Member]	Jul. 02, 2011 Financing Arrangements [Member] Toledo Catalyst Lease [Member]	Nov. 30, 2013 Financing Arrangements [Member] Toledo Catalyst Lease [Member]	Oct. 17, 2013 Financing Arrangements [Member] Delaware City Catalyst Lease [Member]	Oct. 31, 2010 Financing Arrangements [Member] Delaware City Catalyst Lease [Member]	Nov. 21, 2013 Financing Arrangements [Member] Amended Delaware City Catalyst Lease [Member]
Debt Instrument [Line Items]
Debt issued																	$ 675,000,000	$ 25,500,000		$ 20,000,000
Debt fixed interest rate																	8.25%					1.95%					1.85%	1.96%		1.85%
Redemption price as a percentage																	100.00%
Maximum borrowing capacity				1,575,000,000		1,610,000,000
Basis spread on variable rate										0.75%	1.50%	1.75%	2.50%
Commitment fee								0.375%	0.50%
Fronting fee														0.125%
Maximum borrowing capacity, as a percentage of aggregate borrowing capacity				17.50%
Alternative maximum borrowing capacity				35,000,000
Effective consolidated fixed charge coverage ratio during period				1.1
Amount outstanding					15,000,000		0								441,368,000	449,652,000
Installment payments																				530,000
Frequency of installments																				monthly
Debt instrument term																				60 months		3 years	1 year			3 years	8 months	3 years	3 years
Loss on early retirement of debt																					2,797,000
Proceeds from lease	0	665,806,000	0																				9,453,000			18,345,000	12,034,000	2,223,000	17,474,000
Annual lease fee																						180,000		262,000	267,000		150,000			30,000
Facility fee																			322,000							279,000			266,000
Lease fee, year 1																										997,000			1,076,000
Lease fee, year 2																										967,000			946,000
Lease fee, year 3																										$ 810,000			$ 1,048,000