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DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 1 (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Derivatives, Fair Value    
Asset Derivatives $ 19,735 $ 42,022
Liability Derivatives (19,467) (33,905)
Designated as Hedging Instrument | Commodity contracts | Accrued liabilities
   
Derivatives, Fair Value    
Asset Derivatives 48 0
Liability Derivatives 0 (130)
Not Designated as Hedging Instrument
   
Derivatives, Fair Value    
Asset Derivatives 19,687 42,022
Liability Derivatives (19,467) (33,775)
Not Designated as Hedging Instrument | Commodity contracts | Other current assets
   
Derivatives, Fair Value    
Asset Derivatives 9,735 16,168
Liability Derivatives (5,968) (11,220)
Not Designated as Hedging Instrument | Commodity contracts | Other long-term assets, net
   
Derivatives, Fair Value    
Asset Derivatives 2,807 15,883
Liability Derivatives (2,551) (8,906)
Not Designated as Hedging Instrument | Commodity contracts | Accrued liabilities
   
Derivatives, Fair Value    
Asset Derivatives 7,145 4,523
Liability Derivatives (10,948) (6,626)
Not Designated as Hedging Instrument | Commodity contracts | Other long-term liabilities
   
Derivatives, Fair Value    
Asset Derivatives 0 5,448
Liability Derivatives $ 0 $ (7,023)