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DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 1 (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Derivatives, Fair Value    
Asset Derivatives $ 3,996 $ 38,825
Liability Derivatives (31,815) (26,240)
Designated as Hedging Instrument    
Derivatives, Fair Value    
Asset Derivatives 88 4,692
Liability Derivatives (29,033) (1,475)
Designated as Hedging Instrument | Commodity contracts | Other current assets    
Derivatives, Fair Value    
Asset Derivatives 0 1,937
Liability Derivatives 0 (23)
Designated as Hedging Instrument | Commodity contracts | Accrued liabilities    
Derivatives, Fair Value    
Asset Derivatives 88 0
Liability Derivatives (358) 0
Not Designated as Hedging Instrument    
Derivatives, Fair Value    
Asset Derivatives 3,908 34,133
Liability Derivatives (2,782) (24,765)
Not Designated as Hedging Instrument | Commodity contracts | Other current assets    
Derivatives, Fair Value    
Asset Derivatives 2,773 34,016
Liability Derivatives (1,033) (24,528)
Not Designated as Hedging Instrument | Commodity contracts | Accrued liabilities    
Derivatives, Fair Value    
Asset Derivatives 1,135 117
Liability Derivatives (1,749) (237)
Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps | Other long-term assets, net    
Derivatives, Fair Value    
Asset Derivatives 0 2,755
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 $ (28,675) $ (1,452)