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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2014
Recurring basis
Total estimated fair value
Dec. 31, 2013
Recurring basis
Total estimated fair value
Mar. 31, 2014
Recurring basis
Total estimated fair value
Forward fixed price purchase and sale contracts
Dec. 31, 2013
Recurring basis
Total estimated fair value
Forward fixed price purchase and sale contracts
Mar. 31, 2014
Recurring basis
Total estimated fair value
Mark to market loss related to RIN forward commitments
Dec. 31, 2013
Recurring basis
Total estimated fair value
Mark to market loss related to RIN forward commitments
Mar. 31, 2014
Recurring basis
Total estimated fair value
Swap agreements and option contracts
Dec. 31, 2013
Recurring basis
Total estimated fair value
Swap agreements and option contracts
Mar. 31, 2014
Recurring basis
Total estimated fair value
Interest rate cap
Dec. 31, 2013
Recurring basis
Total estimated fair value
Interest rate cap
Mar. 31, 2014
Recurring basis
Total estimated fair value
Interest rate swaps
Dec. 31, 2013
Recurring basis
Total estimated fair value
Interest rate swaps
Mar. 31, 2014
Recurring basis
Total estimated fair value
Foreign currency derivatives
Dec. 31, 2013
Recurring basis
Total estimated fair value
Foreign currency derivatives
Mar. 31, 2014
Recurring basis
Total estimated fair value
Inventories
Dec. 31, 2013
Recurring basis
Total estimated fair value
Inventories
Mar. 31, 2014
Recurring basis
Level 1
Dec. 31, 2013
Recurring basis
Level 1
Mar. 31, 2014
Recurring basis
Level 1
Swap agreements and option contracts
Dec. 31, 2013
Recurring basis
Level 1
Swap agreements and option contracts
Mar. 31, 2014
Recurring basis
Level 2
Dec. 31, 2013
Recurring basis
Level 2
Mar. 31, 2014
Recurring basis
Level 2
Forward fixed price purchase and sale contracts
Dec. 31, 2013
Recurring basis
Level 2
Forward fixed price purchase and sale contracts
Mar. 31, 2014
Recurring basis
Level 2
Mark to market loss related to RIN forward commitments
Dec. 31, 2013
Recurring basis
Level 2
Mark to market loss related to RIN forward commitments
Mar. 31, 2014
Recurring basis
Level 2
Swap agreements and option contracts
Dec. 31, 2013
Recurring basis
Level 2
Swap agreements and option contracts
Mar. 31, 2014
Recurring basis
Level 2
Interest rate cap
Dec. 31, 2013
Recurring basis
Level 2
Interest rate cap
Mar. 31, 2014
Recurring basis
Level 2
Interest rate swaps
Dec. 31, 2013
Recurring basis
Level 2
Interest rate swaps
Mar. 31, 2014
Recurring basis
Level 2
Foreign currency derivatives
Dec. 31, 2013
Recurring basis
Level 2
Foreign currency derivatives
Mar. 31, 2014
Recurring basis
Level 2
Inventories
Dec. 31, 2013
Recurring basis
Level 2
Inventories
Mar. 31, 2014
Recurring basis
Level 3
Dec. 31, 2013
Recurring basis
Level 3
Mar. 31, 2014
Recurring basis
Level 3
Forward fixed price purchase and sale contracts
Dec. 31, 2013
Recurring basis
Level 3
Forward fixed price purchase and sale contracts
Assets:                                                                                  
Hedged inventories                               $ 248,918 $ 452,302                                     $ 248,918 $ 452,302        
Derivative assets       80,488 46,007     58 116 7 25                 10 74     70,353 31,931     48 42 7 25                 10,135 14,076
Broker margin deposits   15,193 21,792                             15,193 21,792                                            
Pension plan   17,666 18,267                             17,666 18,267                                            
Total assets   362,330 538,509                             32,869 40,133     319,326 484,300                             10,135 14,076    
Liabilities:                                                                                  
Derivative liabilities       (89,930) (38,197) (122) (6,166) (10) (108)     (8,785) (9,462) (74) (16)         (10) (74)     (76,605) (33,014) (122) (6,166)   (34)     (8,785) (9,462) (74) (16)         (13,325) (5,183)
Total liabilities   (98,921) (53,949)                             (10) (74)     (85,586) (48,692)                             (13,325) (5,183)    
Changes in fair value of Level 3 financial assets                                                                                  
Fair value at the beginning of the period 8,894                                                                                
Change in fair value recorded in Cost of Sales (12,084)                                                                                
Fair value at the end of the period $ (3,190)