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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Comprehensive Income (Loss) Before Reclassifications, Unrealized Gains (Losses) on Risk-Management Assets/Liabilities $ (5,673) $ (35,013)  
Other Comprehensive (Income) Loss Before Reclassification, Pension and Postretirement Benefit Plan Obligations (8,116) (12,337)  
Other Comprehensive Income (Loss) Before Reclassification, Unrealized Gains (Losses) on Risk-Management Assets/Liabilities of Unconsolidated Affiliates 2,396 (409)  
Other comprehensive income (loss) before reclassifications (11,393) (47,759)  
Other Comprehensive Income (Loss) Reclassification Adjustment from AOCI for Unrealized Gains (Losses) on Risk-Management Assets/Liabilities, Net of Tax 36,870 63,687 $ (6,977)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Other Comprehensive Income Attributable to Equity Method Investments, Net of Tax (28) (164)  
Other Comprehensive Income (Loss), Reclassification Adjustment included in Net Income, Net of Tax 49,785 53,867 5,550
Impact of Merger Transaction On Unrealized Gains (Losses) on Risk Management Assets/Liabilities   (40,288)  
Impact of Merger Transaction on Pension and Postretirement Benefit Plan Obligations   0  
Impact of Merger Transaction on Unrealized Gains (Losses) on Risk Management Assets/Liabilities of Unconsolidated Affiliates   0  
Impact of Merger Transaction on AOCI, Total   (40,288)  
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent 31,197 (29,760)  
Other Comprehensive (Income) Loss, Pension and Postretirement Benefit Plans, after Reclassification Adjustment, after Tax 4,771 (4,175) (16,693)
Other Comprehensive Income (Loss) on investment in unconsolidated affiliates 2,424 (245)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 38,392 (34,180)  
Impact of Adoption of ASU 2018-02 on Unrealized Gains (Losses) on Risk Management Assets/Liabilities (17,020)    
Impact of Adoption of ASU 2018-02 on Pension and Postretirement Benefit Plan Obligations (20,340)    
Impact of Adoption of ASU 2018-02 on Unrealized Gains (Losses) on Risk Management Assets/Liabilities of Unconsolidated Affiliates (741)    
Impact of Adoption of ASU 2018-02 on AOCI, Total (38,101)    
Unrealized gains (losses) on risk management assets/liabilities - December 31 (64,660) (81,915) (52,155)
Pension and Postretirement Benefit Plan Obligations - December 31 (121,785) (105,411) (101,236)
Unrealized gains (losses) on risk-management assets/liabilities of unconsolidated affiliates - December 31 (1,794) (1,204) (959)
Accumulated other comprehensive loss - December 31 (188,239) (188,530) (154,350)
Beginning balance adjustments on unrealized gains (losses) on risk management assets/liabilities   3,078  
Beginning balance adjustments on pension and postretirement benefit plan obligations   (805)  
Beginning balance adjustments on unrealized gains (losses) on risk-management asset/liabilities of unconsolidated affiliates   (2,273)  
Beginning balance adjustments on accumulated other comprehensive loss   0  
Reclassification Adjustment from AOCI on Risk Management Assets/Liabilities, Income Tax 11,013 26,899 (230)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]      
Other Comprehensive Income (Loss) Reclassification Adjustment from AOCI for Unrealized Gains (Losses) on Risk-Management Assets/Liabilities, Net of Tax 36,870 45,541 (676)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Sales [Member] | Commodity Contract [Member]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income (29,596) (69,561) 26,422
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Interest Expense [Member] | Interest Rate Contracts      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income (18,287) (21,025) (19,215)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Total before tax [Member]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income (47,883) (90,586) 7,207
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Tax Expense [Member]      
Reclassification Adjustment from AOCI on Risk Management Assets/Liabilities, Income Tax 11,013 26,899 (230)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Net of tax [Member]      
Other Comprehensive Income (Loss) Reclassification Adjustment from AOCI for Unrealized Gains (Losses) on Risk-Management Assets/Liabilities, Net of Tax 36,870 63,687 (6,977)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Net income attributable to noncontrolling interest [Member]      
Reclassification Adjustment from AOCI on Risk Management Assets/Liabilities Net of Tax, Portion Attributable to Noncontrolling Interest 0 (18,146) 6,301
Accumulated Pension and Postretirement Benefit Plans Adjustment Attributable to Parent [Member]      
Other Comprehensive (Income) Loss, Pension and Postretirement Benefit Plans, Reclassification Adjustment from AOCI, After Tax (12,887) (8,162) (6,210)
Pension and Postretirement Benefit Plans, Amortization of Gain (Loss) (18,398) (15,265) (12,012)
Pension and Postretirement Benefit Plans, Amortization of Prior Service Cost (Credit) 1,662 1,662 1,662
Reclassification Adjustment from AOCI, before Tax, Pension and Postretirement Benefit Plans, Gain (Loss) (16,736) (13,603) (10,350)
Reclassification Adjustment from AOCI, Tax, Pensions and Postretirement Benefit Plans, Gain (Loss) 3,849 5,441 4,140
Accumulated Other Comprehensive Income from Investments in Unconsolidated Affiliates Attributable to Parent [Member]      
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Other Comprehensive Income Attributable to Equity Method Investments, Net of Tax (28) (164) (16)
Reclassification Adjustment from AOCI, Before Tax, Portion Attributable to Unconsolidated Affiliates (36) (367) (63)
Reclassification Adjustment from AOCI, Tax, Portion Attributable to Unconsolidated Affiliates 8 97 10
Accumulated Other Comprehensive Income from Investments in Unconsolidated Affiliates Attributable to Parent [Member] | Net of tax [Member]      
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Other Comprehensive Income Attributable to Equity Method Investments, Net of Tax (28) (270) (53)
Reclassification Adjustment from AOCI, Net of Tax, Portion Attributable to Unconsolidated Affiliates 0 $ (106) $ (37)
Cash Flow Hedging [Member] | Commodity Contract [Member]      
Unrealized Gain Loss On Cash Flow Hedges Net Of Tax Accumulated Other Comprehensive Income Loss 37,589    
Commodity Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months 37,500    
Commodity Cash Flow Hedge Gain Loss To Be Reclassified After Next 12 Months Net 100    
Cash Flow Hedging [Member] | Interest Rate Contracts      
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps. (40,037)    
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net (13,500)    
Cash Flow Hedging [Member] | Forward Contracts [Member]      
Amount of accumulated other comprehensive income (loss) attributable primarily to forward starting interest-rate swaps. $ (62,212)