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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 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 (loss) before reclassification, risk-management assets/liabilities | (71,768) | $ 32,998
Other comprehensive income (loss) before reclassification, retirement and postretirement benefit plan obligations | 129 |
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities of unconsolidated affiliates | 5,937 |
Other comprehensive income (loss) before reclassifications | (65,702) |
Other comprehensive income reclassification adjustment from AOCI for risk-management assets/liabilities, net of tax | 66,032 | 41,387
Other comprehensive income, retirement and other postretirement benefit plans, reclassification adjustment from AOCI, net of tax | 2,901 |
Other comprehensive income, reclassification adjustment from AOCI for other comprehensive income attributable to unconsolidated affiliates, net of tax | 448 |
Other comprehensive income, reclassification adjustment included in net income, net of tax | 69,381 |
Other comprehensive income (loss), risk-management assets/liabilities, after reclassification adjustment, net of tax | (5,736) |
Other comprehensive (income) loss, retirement and other postretirement benefit plans, after reclassification adjustment, net of tax | 3,030 | $ 3,638
Other comprehensive income (loss), risk-management assets/liabilities of unconsolidated affiliates, net of tax | 6,385 |
Other comprehensive income (loss), net of tax | 3,679 |
Risk management assets/liabilities - March 31 | (358,051) |
Retirement and other postretirement benefit plan obligations - March 31 | (104,629) |
Risk-management assets/liabilities of unconsolidated affiliates - March 31 | (4,992) |
Accumulated other comprehensive loss - March 31 | (467,672) |
Cash Flow Hedging [Member] | Commodity Contracts |  |
Unrealized gain loss on cash flow hedges net of tax accumulated other comprehensive income (loss) | (152,351) |
Price risk cash flow hedge unrealized gain (loss) to be reclassified during next 12 months | (147,600) |
Cash Flow Hedging [Member] | Interest Rate Contracts |  |
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps | (156,136) |
Amount of accumulated other comprehensive income (loss) attributable primarily to forward starting interest-rate swaps | (49,564) |
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net | $ (24,500) |

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