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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Risk management assets/liabilities - January 1     $ (352,315)  
Retirement and other postretirement benefit plan obligations - January 1     (107,659)  
Risk-management assets/liabilities of unconsolidated affiliates - January 1     (11,377)  
Accumulated other comprehensive loss - January 1     (471,351)  
Other comprehensive income before reclassification, risk-management assets/liabilities $ 106,289 $ (131,566) 56,747 $ (271,622)
Other comprehensive income before reclassification, retirement and postretirement benefit plan obligations     170  
Other comprehensive income before reclassification, risk-management assets/liabilities of unconsolidated affiliates     14,958  
Other comprehensive income before reclassifications     71,875  
Other comprehensive income reclassification adjustment from AOCI for risk-management assets/liabilities, net of tax 53,953 66,438 190,411 143,029
Other comprehensive income, retirement and other postretirement benefit plans, reclassification adjustment from AOCI, net of tax     8,704  
Other comprehensive income, reclassification adjustment from AOCI for other comprehensive income attributable to unconsolidated affiliates, net of tax     888  
Other comprehensive income, reclassification adjustment included in net income, net of tax     200,003  
Other comprehensive income, risk-management assets/liabilities, after reclassification adjustment, net of tax     247,158  
Other comprehensive income, retirement and other postretirement benefit plans, after reclassification adjustment, net of tax 2,922 $ 4,538 8,874 $ 13,423
Other comprehensive income, risk-management assets/liabilities of unconsolidated affiliates, net of tax     15,846  
Other comprehensive income, net of tax     271,878  
Risk management assets/liabilities - September 30 (105,157)   (105,157)  
Retirement and other postretirement benefit plan obligations - September 30 (98,785)   (98,785)  
Risk-management assets/liabilities of unconsolidated affiliates - September 30 4,469   4,469  
Accumulated other comprehensive loss - September 30 (199,473)   (199,473)  
Cash Flow Hedging [Member] | Commodity Contracts        
Unrealized gain loss on cash flow hedges net of tax accumulated other comprehensive income (loss) (15,711)   (15,711)  
Price risk cash flow hedge unrealized gain (loss) to be reclassified during next 12 months (14,700)   (14,700)  
Cash Flow Hedging [Member] | Interest Rate Contracts        
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps (141,326)   (141,326)  
Amount of accumulated other comprehensive income (loss) attributable primarily to forward starting interest-rate swaps 51,880   51,880  
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net $ (19,000)   $ (19,000)