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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 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     14,255  
Other Comprehensive (Income) Loss Before Reclassification, Pension and Postretirement Benefit Plan Obligations     (583)  
Other Comprehensive Income (Loss) Before Reclassification, Unrealized Gains (Losses) on Risk-Management Assets/Liabilities of Unconsolidated Affiliates     3,816  
Other comprehensive income (loss) before reclassifications     17,488  
Other Comprehensive Income (Loss) Reclassification Adjustment from AOCI for Unrealized Gains (Losses) on Risk-Management Assets/Liabilities, net of tax $ 12,160 $ 9,927 24,136 $ 27,210
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Other Comprehensive Income Attributable to Unconsolidated Affiliates, Net of Tax     (15)  
Other Comprehensive Income (Loss), Reclassification Adjustment included in Net Income, Net of Tax 15,326 5,466 30,554 13,187
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent     38,391  
Other Comprehensive (Income) Loss, Pension and Postretirement Benefit Plans, after Reclassification Adjustment, after Tax 3,235 2,040 5,850 4,081
Other comprehensive income (loss) on investment in unconsolidated affiliates     3,801  
Other Comprehensive Income (Loss), Net of Tax (3,897) 5,474 48,042 49,579
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 - June 30 (61,459)   (61,459)  
Pension and Postretirement Benefit Plan Obligations - June 30 (119,727)   (119,727)  
Unrealized gains (losses) on risk-management assets/liabilities of unconsolidated affiliates - June 30 2,597   2,597  
Accumulated other comprehensive loss - June 30 (178,589)   (178,589)  
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Risk Management Assets/Liabilities 3,631 2,041 7,209 5,406
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 12,160 3,406 24,136 9,064
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 (10,189) (6,796) (21,800) (22,115)
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 (5,602) (5,172) (9,545) (10,501)
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 (15,791) (11,968) (31,345) (32,616)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Tax Expense [Member]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Risk Management Assets/Liabilities 3,631 2,041 7,209 5,406
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 12,160 9,927 24,136 27,210
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Net income attributable to noncontrolling interest [Member]        
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Noncontrolling Interest 0 (6,521) 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 (3,217) (2,038) (6,433) (4,076)
Pension and Postretirement Benefit Plans, Amortization of Gain (Loss) (4,592) (3,812) (9,184) (7,624)
Pension and Postretirement Benefit Plans, Amortization of Prior Service Cost (Credit) 415 415 830 830
Other Comprehensive Income (Loss), Pension and Postretirement Benefit Plans, Gain (Loss), Reclassification Adjustment from AOCI, before Tax (4,177) (3,397) (8,354) (6,794)
Other Comprehensive Income (Loss), Pensions and Postretirement Benefit Plans, Gain (Loss), Reclassification Adjustment from AOCI, Tax 960 1,359 1,921 2,718
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 51 (22) 15 (47)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Other Comprehensive Income Attributable to Unconsolidated Affiliates, Before Tax 66 (85) 19 (181)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Other Comprehensive Income Attributable to Unconsolidated Affiliates, Tax (15) 13 (4) 28
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 51 (72) 15 (153)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Other Comprehensive Income Attributable to Unconsolidated Affiliates, Net of Tax, Portion Attributable to Noncontrolling Interests $ 0 $ (50) 0 (106)
AOCI Attributable to Parent [Member]        
Other Comprehensive Income (Loss), Net of Tax     $ 48,042 $ 18,553