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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 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 $ (173,054) $ (46,530) (140,056) $ (152,671)
Other comprehensive (income) loss before reclassification, retirement and postretirement benefit plan obligations     (142)  
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities of unconsolidated affiliates     3,651  
Other comprehensive income (loss) before reclassifications     (136,547)  
Other comprehensive income reclassification adjustment from AOCI for risk-management assets/liabilities, net of tax 35,204 21,013 76,591 5,849
Other comprehensive income, retirement and other postretirement benefit plans, reclassification adjustment from AOCI, net of tax     9,027  
Other comprehensive income, reclassification adjustment from AOCI for other comprehensive income attributable to unconsolidated affiliates, net of tax     935  
Other comprehensive income, reclassification adjustment included in net income, net of tax     86,553  
Other comprehensive income (loss), risk-management assets/liabilities, after reclassification adjustment, net of tax     (63,465)  
Other comprehensive (income) loss, retirement and other postretirement benefit plans, after reclassification adjustment, net of tax 5,247 $ 3,561 8,885 $ 7,123
Other comprehensive income (loss), risk-management assets/liabilities of unconsolidated affiliates, net of tax     4,586  
Other comprehensive income (loss), net of tax     (49,994)  
Risk management assets/liabilities - June 30 (440,911)   (440,911)  
Retirement and other postretirement benefit plan obligations - June 30 (148,750)   (148,750)  
Risk-management assets/liabilities of unconsolidated affiliates - June 30 (11,782)   (11,782)  
Accumulated other comprehensive loss - June 30 (601,443)   (601,443)  
Cash Flow Hedging [Member] | Commodity Contracts        
Unrealized gain loss on cash flow hedges net of tax accumulated other comprehensive income (loss) (149,749)   (149,749)  
Price risk cash flow hedge unrealized gain (loss) to be reclassified during next 12 months (142,700)   (142,700)  
Commodity cash flow hedge gain (loss) to be reclassified after next 12 months net (7,000)   (7,000)  
Cash Flow Hedging [Member] | Interest Rate Contracts        
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps (178,441)   (178,441)  
Amount of accumulated other comprehensive income (loss) attributable primarily to forward starting interest-rate swaps (112,721)   (112,721)  
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net $ (30,300)   $ (30,300)