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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Risk management assets/liabilities - January 1     $ (377,446)  
Retirement and other postretirement benefit plan obligations - January 1     (157,635)  
Risk-management assets/liabilities of unconsolidated affiliates - January 1     (16,368)  
Accumulated other comprehensive loss - January 1     (551,449)  
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities $ (131,566) $ (15,750) (271,622) $ (168,421)
Other comprehensive (income) loss before reclassification, retirement and postretirement benefit plan obligations     (118)  
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities of unconsolidated affiliates     3,350  
Other comprehensive income (loss) before reclassifications     (268,390)  
Other comprehensive income reclassification adjustment from AOCI for risk-management assets/liabilities, net of tax 66,438 5,361 143,029 11,210
Other comprehensive income, retirement and other postretirement benefit plans, reclassification adjustment from AOCI, net of tax     13,541  
Other comprehensive income, reclassification adjustment from AOCI for other comprehensive income attributable to unconsolidated affiliates, net of tax     1,433  
Other comprehensive income, reclassification adjustment included in net income, net of tax     158,003  
Other comprehensive income (loss), risk-management assets/liabilities, after reclassification adjustment, net of tax     (128,593)  
Other comprehensive (income) loss, retirement and other postretirement benefit plans, after reclassification adjustment, net of tax 4,538 $ 3,562 13,423 $ 10,685
Other comprehensive income (loss), risk-management assets/liabilities of unconsolidated affiliates, net of tax     4,783  
Other comprehensive income (loss), net of tax     (110,387)  
Risk management assets/liabilities - September 30 (506,039)   (506,039)  
Retirement and other postretirement benefit plan obligations - September 30 (144,212)   (144,212)  
Risk-management assets/liabilities of unconsolidated affiliates - September 30 (11,585)   (11,585)  
Accumulated other comprehensive loss - September 30 (661,836)   (661,836)  
Cash Flow Hedging [Member] | Commodity Contracts        
Unrealized gain loss on cash flow hedges net of tax accumulated other comprehensive income (loss) (223,117)   (223,117)  
Price risk cash flow hedge unrealized gain (loss) to be reclassified during next 12 months (206,400)   (206,400)  
Cash Flow Hedging [Member] | Interest Rate Contracts        
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps (170,817)   (170,817)  
Amount of accumulated other comprehensive income (loss) attributable primarily to forward starting interest-rate swaps (112,105)   (112,105)  
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net $ (30,100)   $ (30,100)