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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Risk management assets/liabilities - January 1 $ (233,520)  
Retirement and other postretirement benefit plan obligations - January 1 (131,481)  
Risk-management assets/liabilities of unconsolidated affiliates - January 1 (8,999)  
Accumulated other comprehensive loss - January 1 (374,000)  
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities (106,141) $ (68,944)
Other comprehensive (income) loss before reclassification, retirement and postretirement benefit plan obligations 20  
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities of unconsolidated affiliates (7,777)  
Other comprehensive income (loss) before reclassifications (113,898)  
Other comprehensive income (loss) reclassification adjustment from AOCI for risk-management assets/liabilities, net of tax (15,164) (12,171)
Other comprehensive (income) loss, retirement and other postretirement benefit plans, reclassification adjustment from AOCI, net of tax 3,542  
Other comprehensive income (loss), reclassification adjustment from AOCI for other comprehensive income attributable to unconsolidated affiliates, net of tax 134  
Other comprehensive income (loss), reclassification adjustment included in net income, net of tax (11,488)  
Other comprehensive income (loss), risk-management assets/liabilities, after reclassification adjustment, net of tax (121,305)  
Other comprehensive (income) loss, retirement and other postretirement benefit plans, after reclassification adjustment, net of tax 3,562 2,341
Other comprehensive income (loss), risk-management assets/liabilities of unconsolidated affiliates, net of tax (7,643) (2,511)
Other comprehensive income (loss), net of tax (125,386) $ (81,285)
Risk management assets/liabilities - March 31 (354,825)  
Retirement and other postretirement benefit plan obligations - March 31 (127,919)  
Risk-management assets/liabilities of unconsolidated affiliates - March 31 (16,642)  
Accumulated other comprehensive loss - March 31 (499,386)  
Price risk cash flow hedge unrealized gain (loss) to be reclassified during next 12 months 73,000  
Commodity cash flow hedge gain (loss) to be reclassified after next 12 months net (800)  
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net (29,400)  
Cash Flow Hedging [Member] | Commodity contracts    
Unrealized gain loss on cash flow hedges net of tax accumulated other comprehensive income loss 72,180  
Cash Flow Hedging [Member] | Interest Rate Contract    
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps. (218,877)  
Cash Flow Hedging [Member] | Forward Contracts    
Amount of accumulated other comprehensive income (loss) attributable primarily to forward starting interest-rate swaps. $ (208,128)