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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 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 | 32,998 | $ (106,141)
Other comprehensive (income) loss before reclassification, retirement and postretirement benefit plan obligations | (167) |
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities of unconsolidated affiliates | 7,372 |
Other comprehensive income (loss) before reclassifications | 40,203 |
Other comprehensive income reclassification adjustment from AOCI for risk-management assets/liabilities, net of tax | 41,387 | (15,164)
Other comprehensive income, retirement and other postretirement benefit plans, reclassification adjustment from AOCI, net of tax | 3,805 |
Other comprehensive income, reclassification adjustment from AOCI for other comprehensive income attributable to unconsolidated affiliates, net of tax | 458 |
Other comprehensive income, reclassification adjustment included in net income, net of tax | 45,650 |
Other comprehensive income (loss), risk-management assets/liabilities, after reclassification adjustment, net of tax | 74,385 |
Other comprehensive (income) loss, retirement and other postretirement benefit plans, after reclassification adjustment, net of tax | 3,638 | $ 3,562
Other comprehensive income (loss), risk-management assets/liabilities of unconsolidated affiliates, net of tax | 7,830 |
Other comprehensive income (loss), net of tax | 85,853 |
Risk management assets/liabilities - March 31 | (303,061) |
Retirement and other postretirement benefit plan obligations - March 31 | (153,997) |
Risk-management assets/liabilities of unconsolidated affiliates - March 31 | (8,538) |
Accumulated other comprehensive loss - March 31 | (465,596) |
Cash Flow Hedging [Member] | Commodity Contracts |  |
Unrealized gain loss on cash flow hedges net of tax accumulated other comprehensive income (loss) | (42,201) |
Price risk cash flow hedge unrealized gain (loss) to be reclassified during next 12 months | (47,700) |
Commodity cash flow hedge gain (loss) to be reclassified after next 12 months net | 5,500 |
Cash Flow Hedging [Member] | Interest Rate Contracts |  |
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps. | (186,076) |
Amount of accumulated other comprehensive income (loss) attributable primarily to forward starting interest-rate swaps. | (74,784) |
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net | $ (30,500) |

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