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DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 1 (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivatives, Fair Value    
Asset Derivatives $ 26,277 $ 42,022
Liability Derivatives (23,194) (33,905)
Designated as Hedging Instrument
   
Derivatives, Fair Value    
Asset Derivatives 402 0
Liability Derivatives (13) (130)
Designated as Hedging Instrument | Commodity contracts | Other current assets
   
Derivatives, Fair Value    
Asset Derivatives 402 0
Liability Derivatives (13) 0
Designated as Hedging Instrument | Commodity contracts | Accrued liabilities
   
Derivatives, Fair Value    
Asset Derivatives 0 0
Liability Derivatives 0 (130)
Not Designated as Hedging Instrument
   
Derivatives, Fair Value    
Asset Derivatives 25,875 42,022
Liability Derivatives (23,181) (33,775)
Not Designated as Hedging Instrument | Commodity contracts | Other current assets
   
Derivatives, Fair Value    
Asset Derivatives 17,941 16,168
Liability Derivatives (13,056) (11,220)
Not Designated as Hedging Instrument | Commodity contracts | Other long-term assets, net
   
Derivatives, Fair Value    
Asset Derivatives 1,151 15,883
Liability Derivatives (357) (8,906)
Not Designated as Hedging Instrument | Commodity contracts | Accrued liabilities
   
Derivatives, Fair Value    
Asset Derivatives 2,215 4,523
Liability Derivatives (4,789) (6,626)
Not Designated as Hedging Instrument | Commodity contracts | Other long-term liabilities
   
Derivatives, Fair Value    
Asset Derivatives 4,568 5,448
Liability Derivatives $ (4,979) $ (7,023)