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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Unrealized gains (losses) on risk management assets/liabilities - January 1     $ (81,915)  
Pension and Postretirement Benefit Plan Obligations - January 1     (105,411)  
Unrealized gains (losses) on risk-management assets/liabilities of unconsolidated affiliates - January 1     (1,204)  
Accumulated other comprehensive loss - January 1     (188,530)  
Other Comprehensive Income (Loss) Before Reclassifications, Unrealized Gains (Losses) on Risk-Management Assets/Liabilities     10,729  
Other Comprehensive (Income) Loss Before Reclassification, Pension and Postretirement Benefit Plan Obligations     (563)  
Other Comprehensive Income (Loss) Before Reclassification, Unrealized Gains (Losses) on Risk-Management Assets/Liabilities of Unconsolidated Affiliates     5,336  
Other comprehensive income (loss) before reclassifications     15,502  
Other Comprehensive Income (Loss) Reclassification Adjustment from AOCI for Unrealized Gains (Losses) on Risk-Management Assets/Liabilities, Net of Tax $ 19,261 $ 13,062 43,397 $ 40,272
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Other Comprehensive Income Attributable to Unconsolidated Affiliates, Net of Tax     (55)  
Other Comprehensive Income (Loss), Reclassification Adjustment included in Net Income, Net of Tax 22,437 15,152 52,991 28,339
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent     54,126  
Other Comprehensive (Income) Loss, Pension and Postretirement Benefit Plans, after Reclassification Adjustment, after Tax 3,236 2,041 9,086 6,122
Other comprehensive income (loss) on investment in unconsolidated affiliates     5,281  
Other Comprehensive Income (Loss), Net of Tax 20,451 (5,686) 68,493 43,893
Impact of Adoption of ASU 2018-02 On Unrealized Gains (Losses) on Risk Management Assets/Liabilities     (17,935)  
Impact of Adoption of ASU 2018-02 On Pension and Postretirement Benefit Plan Obligations     (20,166)  
Impact of Adoption of ASU 2018-02 On Unrealized Gains (Losses) on Risk Management Assets/Liabilities of Unconsolidated Affiliates     0  
Impact of Adoption of ASU 2018-02 on AOCI, Total     (38,101)  
Unrealized gains (losses) on risk management assets/liabilities - September 30 (45,724)   (45,724)  
Pension and Postretirement Benefit Plan Obligations - September 30 (116,491)   (116,491)  
Unrealized gains (losses) on risk-management assets/liabilities of unconsolidated affiliates - September 30 4,077   4,077  
Accumulated other comprehensive loss - September 30 (158,138)   (158,138)  
Reclassification Adjustment from AOCI on Risk Management Assets/Liabilities, Income Tax 5,752 7,671 12,962 13,077
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 19,261 13,062 43,397 22,126
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 (20,630) (15,913) (42,430) (38,028)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Interest Expense [Member] | Interest Rate Contract [Member]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income (4,383) (4,820) (13,929) (15,321)
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 (25,013) (20,733) (56,359) (53,349)
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 5,752 7,671 12,962 13,077
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 19,261 13,062 43,397 40,272
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 0 0 (18,146)
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 (3,216) (2,038) (9,649) (6,114)
Pension and Postretirement Benefit Plans, Amortization of Gain (Loss) (4,592) (3,811) (13,776) (11,435)
Pension and Postretirement Benefit Plans, Amortization of Prior Service Cost (Credit) 415 415 1,245 1,245
Reclassification Adjustment from AOCI, before Tax, Pension and Postretirement Benefit Plans, Gain (Loss) (4,177) (3,396) (12,531) (10,190)
Reclassification Adjustment from AOCI, Tax, Pensions and Postretirement Benefit Plans, Gain (Loss) 961 1,358 2,882 4,076
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 Unconsolidated Affiliates, Net of Tax 40 (52) 55 (99)
Reclassification Adjustment from AOCI, Before Tax, Portion Attributable to Unconsolidated Affiliates 52 (83) 71 (264)
Reclassification Adjustment from AOCI, Tax, Portion Attributable to Unconsolidated Affiliates (12) 31 (16) 59
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 Unconsolidated Affiliates, Net of Tax 40 (52) 55 (205)
Reclassification Adjustment from AOCI, Net of Tax, Portion Attributable to Unconsolidated Affiliates $ 0 $ 0 0 (106)
AOCI Attributable to Parent [Member]        
Other Comprehensive Income (Loss), Net of Tax     $ 68,493 $ 12,867