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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Risk management assets/liabilities - January 1 $ (377,446) $ (233,520)  
Retirement and other postretirement benefit plan obligations - January 1 (157,635) (131,481)  
Risk-management assets/liabilities of unconsolidated affiliates - January 1 (16,368) (8,999)  
Accumulated other comprehensive loss - January 1 (551,449) (374,000)  
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities (203,868) (165,023) $ (147,803)
Other comprehensive (income) loss before reclassification, retirement and other postretirement benefit plan obligations 31,897 (40,341)  
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities of unconsolidated affiliates 3,088 (8,635)  
Other comprehensive income (loss) before reclassifications (168,883) (213,999)  
Other comprehensive income reclassification adjustment from AOCI for risk-management assets/liabilities, net of tax 228,999 21,097 (21,057)
Other comprehensive income, retirement and other postretirement benefit plans, reclassification adjustment from AOCI, net of tax 18,079 14,187  
Other comprehensive income, reclassification adjustment from AOCI for other comprehensive income attributable to unconsolidated affiliates, net of tax 1,903 1,266  
Other comprehensive income, reclassification adjustment included in net income, net of tax 248,981 36,550  
Other comprehensive income (loss), risk-management assets/liabilities, after reclassification adjustment, net of tax 25,131 (143,926)  
Other comprehensive (income) loss, retirement and other postretirement benefit plans, after reclassification adjustment, net of tax 49,976 (26,154) (9,696)
Other comprehensive income (loss), risk-management assets/liabilities of unconsolidated affiliates, net of tax 4,991 (7,369)  
Other comprehensive income (loss), net of tax 80,098 (177,449)  
Risk management assets/liabilities - December 31 (352,315) (377,446) (233,520)
Retirement and other postretirement benefit plan obligations - December 31 (107,659) (157,635) (131,481)
Risk-management assets/liabilities of unconsolidated affiliates - December 31 (11,377) (16,368) (8,999)
Accumulated other comprehensive loss - December 31 (471,351) $ (551,449) $ (374,000)
Cash Flow Hedging [Member] | Commodity Contract      
Unrealized gain loss on cash flow hedges net of tax accumulated other comprehensive income loss (76,942)    
Price risk cash flow hedge unrealized gain (loss) to be reclassified during next 12 months (76,800)    
Cash Flow Hedging [Member] | Interest Rate Contract      
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps (163,320)    
Amount of accumulated other comprehensive income (loss) attributable primarily to forward starting interest-rate swaps (112,053)    
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net $ (27,100)