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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Risk management assets/liabilities - January 1 $ (352,315)  
Retirement and other postretirement benefit plan obligations - January 1 (107,659)  
Risk-management assets/liabilities of unconsolidated affiliates - January 1 (11,377)  
Accumulated other comprehensive loss - January 1 (471,351)  
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities (71,768) $ 32,998
Other comprehensive income (loss) before reclassification, retirement and postretirement benefit plan obligations 129  
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities of unconsolidated affiliates 5,937  
Other comprehensive income (loss) before reclassifications (65,702)  
Other comprehensive income reclassification adjustment from AOCI for risk-management assets/liabilities, net of tax 66,032 41,387
Other comprehensive income, retirement and other postretirement benefit plans, reclassification adjustment from AOCI, net of tax 2,901  
Other comprehensive income, reclassification adjustment from AOCI for other comprehensive income attributable to unconsolidated affiliates, net of tax 448  
Other comprehensive income, reclassification adjustment included in net income, net of tax 69,381  
Other comprehensive income (loss), risk-management assets/liabilities, after reclassification adjustment, net of tax (5,736)  
Other comprehensive (income) loss, retirement and other postretirement benefit plans, after reclassification adjustment, net of tax 3,030 $ 3,638
Other comprehensive income (loss), risk-management assets/liabilities of unconsolidated affiliates, net of tax 6,385  
Other comprehensive income (loss), net of tax 3,679  
Risk management assets/liabilities - March 31 (358,051)  
Retirement and other postretirement benefit plan obligations - March 31 (104,629)  
Risk-management assets/liabilities of unconsolidated affiliates - March 31 (4,992)  
Accumulated other comprehensive loss - March 31 (467,672)  
Cash Flow Hedging [Member] | Commodity Contracts    
Unrealized gain loss on cash flow hedges net of tax accumulated other comprehensive income (loss) (152,351)  
Price risk cash flow hedge unrealized gain (loss) to be reclassified during next 12 months (147,600)  
Cash Flow Hedging [Member] | Interest Rate Contracts    
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps (156,136)  
Amount of accumulated other comprehensive income (loss) attributable primarily to forward starting interest-rate swaps (49,564)  
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net $ (24,500)