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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Risk management assets/liabilities - January 1 | $ (377,446) | $ (233,520) |
Retirement and other postretirement benefit plan obligations - January 1 | (157,635) | (131,481) |
Risk-management assets/liabilities of unconsolidated affiliates - January 1 | (16,368) | (8,999) |
Accumulated other comprehensive loss - January 1 | (551,449) | (374,000) |
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities | (203,868) | (165,023) | $ (147,803)
Other comprehensive (income) loss before reclassification, retirement and other postretirement benefit plan obligations | 31,897 | (40,341) |
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities of unconsolidated affiliates | 3,088 | (8,635) |
Other comprehensive income (loss) before reclassifications | (168,883) | (213,999) |
Other comprehensive income reclassification adjustment from AOCI for risk-management assets/liabilities, net of tax | 228,999 | 21,097 | (21,057)
Other comprehensive income, retirement and other postretirement benefit plans, reclassification adjustment from AOCI, net of tax | 18,079 | 14,187 |
Other comprehensive income, reclassification adjustment from AOCI for other comprehensive income attributable to unconsolidated affiliates, net of tax | 1,903 | 1,266 |
Other comprehensive income, reclassification adjustment included in net income, net of tax | 248,981 | 36,550 |
Other comprehensive income (loss), risk-management assets/liabilities, after reclassification adjustment, net of tax | 25,131 | (143,926) |
Other comprehensive (income) loss, retirement and other postretirement benefit plans, after reclassification adjustment, net of tax | 49,976 | (26,154) | (9,696)
Other comprehensive income (loss), risk-management assets/liabilities of unconsolidated affiliates, net of tax | 4,991 | (7,369) |
Other comprehensive income (loss), net of tax | 80,098 | (177,449) |
Risk management assets/liabilities - December 31 | (352,315) | (377,446) | (233,520)
Retirement and other postretirement benefit plan obligations - December 31 | (107,659) | (157,635) | (131,481)
Risk-management assets/liabilities of unconsolidated affiliates - December 31 | (11,377) | (16,368) | (8,999)
Accumulated other comprehensive loss - December 31 | (471,351) | $ (551,449) | $ (374,000)
Cash Flow Hedging [Member] | Commodity Contract |  |  |
Unrealized gain loss on cash flow hedges net of tax accumulated other comprehensive income loss | (76,942) |  |
Price risk cash flow hedge unrealized gain (loss) to be reclassified during next 12 months | (76,800) |  |
Cash Flow Hedging [Member] | Interest Rate Contract |  |  |
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps | (163,320) |  |
Amount of accumulated other comprehensive income (loss) attributable primarily to forward starting interest-rate swaps | (112,053) |  |
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net | $ (27,100) |  |

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