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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 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 $ 22,226 $ (173,054) (49,542) $ (140,056)
Other comprehensive income (loss) before reclassification, retirement and postretirement benefit plan obligations     149  
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities of unconsolidated affiliates     10,956  
Other comprehensive income (loss) before reclassifications     (38,437)  
Other comprehensive income reclassification adjustment from AOCI for risk-management assets/liabilities, net of tax 70,426 35,204 136,458 76,591
Other comprehensive income, retirement and other postretirement benefit plans, reclassification adjustment from AOCI, net of tax     5,803  
Other comprehensive income, reclassification adjustment from AOCI for other comprehensive income attributable to unconsolidated affiliates, net of tax     772  
Other comprehensive income, reclassification adjustment included in net income, net of tax     143,033  
Other comprehensive income (loss), risk-management assets/liabilities, after reclassification adjustment, net of tax     86,916  
Other comprehensive (income) loss, retirement and other postretirement benefit plans, after reclassification adjustment, net of tax 2,922 $ 5,247 5,952 $ 8,885
Other comprehensive income (loss), risk-management assets/liabilities of unconsolidated affiliates, net of tax     11,728  
Other comprehensive income (loss), net of tax     104,596  
Risk management assets/liabilities - June 30 (265,399)   (265,399)  
Retirement and other postretirement benefit plan obligations - June 30 (101,707)   (101,707)  
Risk-management assets/liabilities of unconsolidated affiliates - June 30 351   351  
Accumulated other comprehensive loss - June 30 (366,755)   (366,755)  
Cash Flow Hedging [Member] | Commodity Contracts        
Unrealized gain loss on cash flow hedges net of tax accumulated other comprehensive income (loss) (115,725)   (115,725)  
Price risk cash flow hedge unrealized gain (loss) to be reclassified during next 12 months (104,100)   (104,100)  
Cash Flow Hedging [Member] | Interest Rate Contracts        
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps (148,726)   (148,726)  
Amount of accumulated other comprehensive income (loss) attributable primarily to forward starting interest-rate swaps (948)   (948)  
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net $ (21,700)   $ (21,700)