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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities $ (165,023) $ (147,803) $ (5,673)
Other comprehensive (income) loss before reclassification, retirement and other postretirement benefit plan obligations (40,341) (19,490)  
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities of unconsolidated affiliates (8,635) (7,275)  
Other comprehensive income (loss) before reclassifications (213,999) (174,568)  
Other comprehensive income reclassification adjustment from AOCI for risk-management assets/liabilities, net of tax 21,097 (21,057) 36,870
Other comprehensive income, retirement and other postretirement benefit plans, reclassification adjustment from AOCI, net of tax 14,187 9,794  
Other comprehensive income, reclassification adjustment from AOCI for other comprehensive income attributable to unconsolidated affiliates, net of tax 1,266 70  
Other comprehensive income, reclassification adjustment included in net income, net of tax 36,550 (11,193)  
Other comprehensive income (loss), risk-management assets/liabilities, after reclassification adjustment, net of tax (143,926) (168,860)  
Other comprehensive (income) loss, retirement and other postretirement benefit plans, after reclassification adjustment, net of tax (26,154) (9,696) 4,771
Other comprehensive income (loss), risk-management assets/liabilities of unconsolidated affiliates, net of tax (7,369) (7,205)  
Other comprehensive income (loss), net of tax (177,449) (185,761)  
Risk management assets/liabilities (377,446) (233,520) (64,660)
Retirement and other postretirement benefit plan obligations (157,635) (131,481) (121,785)
Risk-management assets/liabilities of unconsolidated affiliates (16,368) (8,999) (1,794)
Accumulated other comprehensive loss (551,449) $ (374,000) $ (188,239)
Cash Flow Hedging [Member] | Commodity Contract      
Unrealized gain loss on cash flow hedges net of tax accumulated other comprehensive income loss (27,303)    
Price risk cash flow hedge unrealized gain (loss) to be reclassified during next 12 months (27,000)    
Commodity cash flow hedge gain (loss) to be reclassified after next 12 months net (300)    
Cash Flow Hedging [Member] | Interest Rate Contract      
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps. (193,519)    
Amount of accumulated other comprehensive income (loss) attributable primarily to forward starting interest-rate swaps. (156,624)    
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net $ (30,500)