v2.4.0.6
FAIR VALUE MEASUREMENTS Table 1 (Details) (Recurring Fair Value Measurements, USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair Value Assets and Liabilities Measured on Recurring Basis    
Fair Value Assets and Liabilities Measured on Recurring Basis $ (20,804) $ (12,444)
Fair Value Level 1
    
Fair Value Assets and Liabilities Measured on Recurring Basis    
Fair Value Assets and Liabilities Measured on Recurring Basis 17,813 5,506
Fair Value Level 2
    
Fair Value Assets and Liabilities Measured on Recurring Basis    
Fair Value Assets and Liabilities Measured on Recurring Basis (38,617) (17,950)
Fair Value Level 3
    
Fair Value Assets and Liabilities Measured on Recurring Basis    
Fair Value Assets and Liabilities Measured on Recurring Basis 0 0
Other current assets
    
Fair Value Assets and Liabilities Measured on Recurring Basis    
Product Imbalances 448 2,117
Commodity derivatives 45,875 12,112
Other current assets | Fair Value Level 1
    
Fair Value Assets and Liabilities Measured on Recurring Basis    
Product Imbalances 448 2,117
Commodity derivatives 44,605 10,282
Other current assets | Fair Value Level 2
    
Fair Value Assets and Liabilities Measured on Recurring Basis    
Product Imbalances 0 0
Commodity derivatives 1,270 1,830
Other current assets | Fair Value Level 3
    
Fair Value Assets and Liabilities Measured on Recurring Basis    
Product Imbalances 0 0
Commodity derivatives 0 0
Other long-term assets, net
    
Fair Value Assets and Liabilities Measured on Recurring Basis    
Commodity derivatives 9,096 27,084
Interest Rate Swaps   2,335
Other long-term assets, net | Fair Value Level 1
    
Fair Value Assets and Liabilities Measured on Recurring Basis    
Commodity derivatives 0 0
Interest Rate Swaps   0
Other long-term assets, net | Fair Value Level 2
    
Fair Value Assets and Liabilities Measured on Recurring Basis    
Commodity derivatives 9,096 27,084
Interest Rate Swaps   2,335
Other long-term assets, net | Fair Value Level 3
    
Fair Value Assets and Liabilities Measured on Recurring Basis    
Commodity derivatives 0 0
Interest Rate Swaps   0
Accrued liabilities
    
Fair Value Assets and Liabilities Measured on Recurring Basis    
Product Imbalances (450) (1,469)
Commodity derivatives (37,137) (5,424)
Interest Rate Swaps (37,291) (22,009)
Accrued liabilities | Fair Value Level 1
    
Fair Value Assets and Liabilities Measured on Recurring Basis    
Product Imbalances (450) (1,469)
Commodity derivatives (26,790) (5,424)
Interest Rate Swaps 0 0
Accrued liabilities | Fair Value Level 2
    
Fair Value Assets and Liabilities Measured on Recurring Basis    
Product Imbalances 0 0
Commodity derivatives (10,347) 0
Interest Rate Swaps (37,291) (22,009)
Accrued liabilities | Fair Value Level 3
    
Fair Value Assets and Liabilities Measured on Recurring Basis    
Product Imbalances 0 0
Commodity derivatives 0 0
Interest Rate Swaps 0 0
Other long-term liabilities
    
Fair Value Assets and Liabilities Measured on Recurring Basis    
Commodity derivatives (1,345)  
Interest Rate Swaps   (27,190)
Other long-term liabilities | Fair Value Level 1
    
Fair Value Assets and Liabilities Measured on Recurring Basis    
Commodity derivatives 0  
Interest Rate Swaps   0
Other long-term liabilities | Fair Value Level 2
    
Fair Value Assets and Liabilities Measured on Recurring Basis    
Commodity derivatives (1,345)  
Interest Rate Swaps   (27,190)
Other long-term liabilities | Fair Value Level 3
    
Fair Value Assets and Liabilities Measured on Recurring Basis    
Commodity derivatives 0  
Interest Rate Swaps   $ 0