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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Risk management assets/liabilities - January 1 $ (377,446)  
Retirement and other postretirement benefit plan obligations - January 1 (157,635)  
Risk-management assets/liabilities of unconsolidated affiliates - January 1 (16,368)  
Accumulated other comprehensive loss - January 1 (551,449)  
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities 32,998 $ (106,141)
Other comprehensive (income) loss before reclassification, retirement and postretirement benefit plan obligations (167)  
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities of unconsolidated affiliates 7,372  
Other comprehensive income (loss) before reclassifications 40,203  
Other comprehensive income reclassification adjustment from AOCI for risk-management assets/liabilities, net of tax 41,387 (15,164)
Other comprehensive income, retirement and other postretirement benefit plans, reclassification adjustment from AOCI, net of tax 3,805  
Other comprehensive income, reclassification adjustment from AOCI for other comprehensive income attributable to unconsolidated affiliates, net of tax 458  
Other comprehensive income, reclassification adjustment included in net income, net of tax 45,650  
Other comprehensive income (loss), risk-management assets/liabilities, after reclassification adjustment, net of tax 74,385  
Other comprehensive (income) loss, retirement and other postretirement benefit plans, after reclassification adjustment, net of tax 3,638 $ 3,562
Other comprehensive income (loss), risk-management assets/liabilities of unconsolidated affiliates, net of tax 7,830  
Other comprehensive income (loss), net of tax 85,853  
Risk management assets/liabilities - March 31 (303,061)  
Retirement and other postretirement benefit plan obligations - March 31 (153,997)  
Risk-management assets/liabilities of unconsolidated affiliates - March 31 (8,538)  
Accumulated other comprehensive loss - March 31 (465,596)  
Cash Flow Hedging [Member] | Commodity Contracts    
Unrealized gain loss on cash flow hedges net of tax accumulated other comprehensive income (loss) (42,201)  
Price risk cash flow hedge unrealized gain (loss) to be reclassified during next 12 months (47,700)  
Commodity cash flow hedge gain (loss) to be reclassified after next 12 months net 5,500  
Cash Flow Hedging [Member] | Interest Rate Contracts    
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps. (186,076)  
Amount of accumulated other comprehensive income (loss) attributable primarily to forward starting interest-rate swaps. (74,784)  
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net $ (30,500)