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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Risk management assets/liabilities - January 1 $ (352,315) $ (377,446)  
Retirement and other postretirement benefit plan obligations - January 1 (107,659) (157,635)  
Risk-management assets/liabilities of unconsolidated affiliates - January 1 (11,377) (16,368)  
Accumulated other comprehensive loss - January 1 (471,351) (551,449)  
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities 93,451 (203,868) $ (165,023)
Other comprehensive income before reclassification, retirement and other postretirement benefit plan obligations 41,140 31,897  
Other comprehensive income before reclassification, risk-management assets/liabilities of unconsolidated affiliates 15,183 3,088  
Other comprehensive income (loss) before reclassifications 149,774 (168,883)  
Other comprehensive income reclassification adjustment from AOCI for risk-management assets/liabilities, net of tax 200,933 228,999 21,097
Other comprehensive income, retirement and other postretirement benefit plans, reclassification adjustment from AOCI, net of tax 11,624 18,079  
Other comprehensive income, reclassification adjustment from AOCI for other comprehensive income attributable to unconsolidated affiliates, net of tax 764 1,903  
Other comprehensive income, reclassification adjustment included in net income, net of tax 213,321 248,981  
Other comprehensive income, risk-management assets/liabilities, after reclassification adjustment, net of tax 294,384 25,131  
Other comprehensive income, retirement and other postretirement benefit plans, after reclassification adjustment, net of tax 52,764 49,976 (26,154)
Other comprehensive income, risk-management assets/liabilities of unconsolidated affiliates, net of tax 15,947 4,991  
Risk management assets/liabilities - December 31 (57,931) (352,315) (377,446)
Retirement and other postretirement benefit plan obligations - December 31 (54,895) (107,659) (157,635)
Risk-management assets/liabilities of unconsolidated affiliates - December 31 4,570 (11,377) (16,368)
Accumulated other comprehensive loss - December 31 (108,256) (471,351) (551,449)
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), Net of Tax 363,095 80,098 (177,449)
Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), Net of Tax 363,095 $ 80,098 $ (177,449)
Cash Flow Hedging [Member] | Commodity Contract      
Unrealized gain loss on cash flow hedges net of tax accumulated other comprehensive income 32,611    
Price risk cash flow hedge unrealized gain (loss) to be reclassified during next 12 months 28,700    
Cash Flow Hedging [Member] | Interest Rate Contracts      
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps. (115,616)    
Amount of accumulated other comprehensive income attributable primarily to forward starting interest-rate swaps. 25,074    
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net $ (18,000)