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FAIR VALUE MEASUREMENTS (Fair Value and Carrying Value of Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Carrying value $ 722,828 $ 735,576
Long-term debt, Fair value 753,875 765,657
Long-term Debt and Capital Lease Obligations, Current 12,491 12,029
Long-Term Debt And Capital Lease Obligations, Current, Fair Value Disclosure 12,491 12,029
Long-term debt 710,337 723,547
Long-term debt, excluding current maturities, Fair value 741,384 753,628
Senior secured notes [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Carrying value 667,738 667,487
Long-term debt, Fair value 698,785 697,568
Long-term Line of Credit 0 [1] 15,000 [1]
Lines of Credit, Fair Value Disclosure 0 [1] 15,000 [1]
Catalyst lease [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Carrying value 55,090 [2] 53,089 [2]
Long-term debt, Fair value $ 55,090 [2] $ 53,089 [2]
[1] 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.
[2] 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.