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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities | $ (165,023) | $ (147,803) | $ (5,673)
Other comprehensive (income) loss before reclassification, retirement and other postretirement benefit plan obligations | (40,341) | (19,490) |
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities of unconsolidated affiliates | (8,635) | (7,275) |
Other comprehensive income (loss) before reclassifications | (213,999) | (174,568) |
Other comprehensive income reclassification adjustment from AOCI for risk-management assets/liabilities, net of tax | 21,097 | (21,057) | 36,870
Other comprehensive income, retirement and other postretirement benefit plans, reclassification adjustment from AOCI, net of tax | 14,187 | 9,794 |
Other comprehensive income, reclassification adjustment from AOCI for other comprehensive income attributable to unconsolidated affiliates, net of tax | 1,266 | 70 |
Other comprehensive income, reclassification adjustment included in net income, net of tax | 36,550 | (11,193) |
Other comprehensive income (loss), risk-management assets/liabilities, after reclassification adjustment, net of tax | (143,926) | (168,860) |
Other comprehensive (income) loss, retirement and other postretirement benefit plans, after reclassification adjustment, net of tax | (26,154) | (9,696) | 4,771
Other comprehensive income (loss), risk-management assets/liabilities of unconsolidated affiliates, net of tax | (7,369) | (7,205) |
Other comprehensive income (loss), net of tax | (177,449) | (185,761) |
Risk management assets/liabilities | (377,446) | (233,520) | (64,660)
Retirement and other postretirement benefit plan obligations | (157,635) | (131,481) | (121,785)
Risk-management assets/liabilities of unconsolidated affiliates | (16,368) | (8,999) | (1,794)
Accumulated other comprehensive loss | (551,449) | $ (374,000) | $ (188,239)
Cash Flow Hedging [Member] | Commodity Contract |  |  |
Unrealized gain loss on cash flow hedges net of tax accumulated other comprehensive income loss | (27,303) |  |
Price risk cash flow hedge unrealized gain (loss) to be reclassified during next 12 months | (27,000) |  |
Commodity cash flow hedge gain (loss) to be reclassified after next 12 months net | (300) |  |
Cash Flow Hedging [Member] | Interest Rate Contract |  |  |
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps. | (193,519) |  |
Amount of accumulated other comprehensive income (loss) attributable primarily to forward starting interest-rate swaps. | (156,624) |  |
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net | $ (30,500) |  |

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