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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES Part 3 (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]          
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (178,589)   $ (178,589)   $ (188,530)
Cash Flow Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Net   $ (5,997)   $ 22,860  
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive (Loss), Net (26,323)   18,513    
Total Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Net Income   (11,968)   (32,616)  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Net (15,791)   (31,345)    
Commodity Contract [Member] | Cash Flow Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Unrealized Gain (Loss) On Cash Flow Hedges Net Of Tax Accumulated Other Comprehensive Income Loss (29,300)   (29,300)    
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months (25,300)   (25,300)    
Commodity Cash Flow Hedge Gain (Loss) To Be Reclassified After Next 12 Months Net (4,000)   (4,000)    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Net   8,998   36,326  
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive (Loss), Net (46,388)   (25,463)    
Commodity Contract [Member] | Commodity sales revenues | Cash Flow Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Total Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Net Income   (6,796)   (22,115)  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Net (10,189)   (21,800)    
Interest Rate Contract [Member] | Cash Flow Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps. (47,300)   (47,300)    
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net (13,600)   (13,600)    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Net   (14,995)   (13,466)  
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive (Loss), Net 20,065   43,976    
Interest Rate Contract [Member] | Interest expense | Cash Flow Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Total Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Net Income   $ (5,172)   $ (10,501)  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Net $ (5,602)   $ (9,545)