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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) |

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