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FAIR VALUE MEASUREMENTS (Fair Value and Carrying Value of Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Carrying value $ 1,880,819 $ 1,877,637
Long-term debt, Fair value 1,876,804 1,878,413
Current maturities, Carrying value 0 0
Current maturities, Fair value 0 0
Deferred financing costs, net 38,917 41,282
Long-term debt excluding current maturities, Carrying value 1,841,902 1,836,355
Long-term debt excluding current maturities, Fair value 1,876,804 1,878,413
Senior secured notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Carrying value [1] 669,940 669,644
Long-term debt, Fair value [1] 702,571 706,246
Line of Credit Facility, Amount Outstanding [2] 0 0
Line of credit, Fair value [2] 0 0
2023 Senior Secured Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Fair value [1] 474,138 492,452
Long-term Debt, Gross [1] 500,000 500,000
Senior Secured Notes Issued in 2015 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Line of Credit Facility, Amount Outstanding [1] 350,000 350,000
Line of credit, Fair value [1] 339,216 321,722
Rail Facility [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Line of Credit Facility, Amount Outstanding [2] 67,491 67,491
Line of credit, Fair value [2] 67,491 67,491
PBFX Term Loan [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Carrying value [2] 234,200 234,200
Long-term debt, Fair value [2] 234,200 234,200
PBFX Revolving Credit Facility [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Line of Credit Facility, Amount Outstanding [2] 24,500 24,500
Line of credit, Fair value [2] 24,500 24,500
Catalyst lease obligations [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Carrying value [3] 34,688 31,802
Long-term debt, Fair value [3] $ 34,688 $ 31,802
[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 and the PBFX Senior 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.