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FAIR VALUE MEASUREMENTS (Fair Value and Carrying Value of Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 722,565 $ 709,980
Long-term debt, excluding current maturities, Fair value 740,241 744,405
Senior secured notes [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Carrying value 667,242 [1] 666,538 [1]
Long-term debt, Fair value 684,918 [1] 700,963 [1]
Long-term Line of Credit 15,000 [2] 0 [2]
Lines of Credit, Fair Value Disclosure 15,000 [2] 0 [2]
Catalyst lease [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Carrying value 40,323 [3] 43,442 [3]
Long-term debt, Fair value $ 40,323 [3] $ 43,442 [3]
[1] 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 secured notes.
[2] 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.
[3] 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.