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DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 1 (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Derivatives, Fair Value    
Asset Derivatives $ 8,863 $ 38,825
Liability Derivatives (62,612) (26,240)
Designated as Hedging Instruments    
Derivatives, Fair Value    
Asset Derivatives 333 4,692
Liability Derivatives (49,359) (1,475)
Designated as Hedging Instruments | Commodity contracts | Other current assets    
Derivatives, Fair Value    
Asset Derivatives 0 1,937
Liability Derivatives 0 (23)
Designated as Hedging Instruments | Commodity contracts | Accrued liabilities    
Derivatives, Fair Value    
Asset Derivatives 333 0
Liability Derivatives (484) 0
Designated as Hedging Instruments | Interest rate swaps | Other long-term assets, net    
Derivatives, Fair Value    
Asset Derivatives 0 2,755
Liability Derivatives 0 0
Designated as Hedging Instruments | Interest rate swaps | Other long-term liabilities    
Derivatives, Fair Value    
Asset Derivatives 0 0
Liability Derivatives (48,875) (1,452)
Not Designated as Hedging Instruments    
Derivatives, Fair Value    
Asset Derivatives 8,530 34,133
Liability Derivatives (13,253) (24,765)
Not Designated as Hedging Instruments | Commodity contracts | Other current assets    
Derivatives, Fair Value    
Asset Derivatives 224 34,016
Liability Derivatives 0 (24,528)
Not Designated as Hedging Instruments | Commodity contracts | Accrued liabilities    
Derivatives, Fair Value    
Asset Derivatives 8,306 117
Liability Derivatives $ (13,253) $ (237)