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DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 1 (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivatives, Fair Value    
Asset Derivatives $ 42,022 $ 80,468
Liability Derivatives (33,905) (122,025)
Designated as Hedging Instrument
   
Derivatives, Fair Value    
Asset Derivatives 0 1,471
Liability Derivatives (130) (41,722)
Designated as Hedging Instrument | Commodity contracts | Other current assets
   
Derivatives, Fair Value    
Asset Derivatives 0 1,471
Liability Derivatives 0 (811)
Designated as Hedging Instrument | Commodity contracts | Accrued liabilities
   
Derivatives, Fair Value    
Asset Derivatives 0 0
Liability Derivatives (130) 0
Designated as Hedging Instrument | Interest rate swaps | Accrued liabilities
   
Derivatives, Fair Value    
Asset Derivatives 0 0
Liability Derivatives 0 (40,911)
Not Designated as Hedging Instrument
   
Derivatives, Fair Value    
Asset Derivatives 42,022 78,997
Liability Derivatives (33,775) (80,303)
Not Designated as Hedging Instrument | Commodity contracts | Other current assets
   
Derivatives, Fair Value    
Asset Derivatives 16,168 22,269
Liability Derivatives (11,220) (13,571)
Not Designated as Hedging Instrument | Commodity contracts | Accrued liabilities
   
Derivatives, Fair Value    
Asset Derivatives 4,523 17,406
Liability Derivatives (6,626) (36,616)
Not Designated as Hedging Instrument | Commodity contracts | Other long-term assets, net
   
Derivatives, Fair Value    
Asset Derivatives 15,883 39,322
Liability Derivatives (8,906) (30,116)
Not Designated as Hedging Instrument | Commodity contracts | Other long-term liabilities
   
Derivatives, Fair Value    
Asset Derivatives 5,448 0
Liability Derivatives $ (7,023) $ 0