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DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 1 (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Derivatives, Fair Value    
Asset Derivatives $ 38,825 $ 57,394
Liability Derivatives (26,240) (45,655)
Designated as Hedging Instrument    
Derivatives, Fair Value    
Asset Derivatives 4,692 5,609
Liability Derivatives (1,475) 0
Designated as Hedging Instrument | Commodity contracts | Other current assets    
Derivatives, Fair Value    
Asset Derivatives 1,937 5,609
Liability Derivatives (23) 0
Not Designated as Hedging Instrument    
Derivatives, Fair Value    
Asset Derivatives 34,133 51,785
Liability Derivatives (24,765) (45,655)
Not Designated as Hedging Instrument | Commodity contracts | Other current assets    
Derivatives, Fair Value    
Asset Derivatives 34,016 38,704
Liability Derivatives (24,528) (27,951)
Not Designated as Hedging Instrument | Commodity contracts | Accrued liabilities    
Derivatives, Fair Value    
Asset Derivatives 117 13,081
Liability Derivatives (237) (17,704)
Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps | Other long-term assets, net    
Derivatives, Fair Value    
Asset Derivatives 2,755 0
Liability Derivatives 0 0
Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps | Other long-term liabilities    
Derivatives, Fair Value    
Asset Derivatives 0 0
Liability Derivatives $ (1,452) $ 0