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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Part 3 (Details) - Cash Flow Hedging [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive (Loss), Net $ (7,367)    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Net   $ (40,414) $ (35,752)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Net (47,883)    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Net   (90,586) 7,207
Commodity contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive (Loss), Net 53,217    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Net   (40,577) (78,513)
Commodity contracts | Commodity sales revenues      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Net   (69,561) 26,422
Interest Rate Contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive (Loss), Net (60,584)    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Net   163 42,761
Interest Rate Contracts | Interest expense      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Net   $ (21,025) $ (19,215)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Commodity contracts | Commodity sales revenues      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Net (29,596)    
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Interest Rate Contracts | Interest expense      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Net $ (18,287)