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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Risk management assets/liabilities - January 1 |  | $ (233,520) |  |  | $ (233,520) |
Retirement and other postretirement benefit plan obligations - January 1 |  | (131,481) |  |  | (131,481) |
Risk-management assets/liabilities of unconsolidated affiliates - January 1 |  | (8,999) |  |  | (8,999) |
Accumulated other comprehensive loss - January 1 |  | (374,000) |  |  | (374,000) |
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities | $ (46,530) |  | $ (57,029) |  | (152,671) | $ (125,973)
Other comprehensive (income) loss before reclassification, retirement and postretirement benefit plan obligations |  |  |  |  | 39 |
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities of unconsolidated affiliates |  |  |  |  | (11,567) |
Other comprehensive income (loss) before reclassifications |  |  |  |  | (164,199) |
Other comprehensive income (loss) reclassification adjustment from AOCI for risk-management assets/liabilities, net of tax | 21,013 |  | (8,625) |  | 5,849 | (20,796)
Other comprehensive (income) loss, retirement and other postretirement benefit plans, reclassification adjustment from AOCI, net of tax |  |  |  |  | 7,084 |
Other comprehensive income (loss), reclassification adjustment from AOCI for other comprehensive income attributable to unconsolidated affiliates, net of tax |  |  |  |  | 363 |
Other comprehensive income (loss), reclassification adjustment included in net income, net of tax |  |  |  |  | 13,296 |
Other comprehensive income (loss), risk-management assets/liabilities, after reclassification adjustment, net of tax |  |  |  |  | (146,822) |
Other comprehensive (income) loss, retirement and other postretirement benefit plans, after reclassification adjustment, net of tax | 3,561 |  | 2,465 |  | 7,123 | 4,806
Other comprehensive income (loss), risk-management assets/liabilities of unconsolidated affiliates, net of tax | (3,561) |  | (3,683) |  | (11,204) | (6,194)
Other comprehensive income (loss), net of tax | (25,517) | $ (125,386) | $ (66,872) | $ (81,285) | (150,903) | $ (148,157)
Risk management assets/liabilities - June 30 | (380,342) |  |  |  | (380,342) |
Retirement and other postretirement benefit plan obligations - June 30 | (124,358) |  |  |  | (124,358) |
Risk-management assets/liabilities of unconsolidated affiliates - June 30 | (20,203) |  |  |  | (20,203) |
Accumulated other comprehensive loss - June 30 | (524,903) |  |  |  | (524,903) |
Cash Flow Hedging [Member] | Commodity contracts |  |  |  |  |  |
Unrealized gain loss on cash flow hedges net of tax accumulated other comprehensive income loss | 12,317 |  |  |  | 12,317 |
Price risk cash flow hedge unrealized gain (loss) to be reclassified during next 12 months | 12,600 |  |  |  | 12,600 |
Commodity cash flow hedge gain (loss) to be reclassified after next 12 months net | (300) |  |  |  | (300) |
Cash Flow Hedging [Member] | Interest-rate contracts |  |  |  |  |  |
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps. | (206,931) |  |  |  | (206,931) |
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net | (30,000) |  |  |  | (30,000) |
Cash Flow Hedging [Member] | Forward contracts |  |  |  |  |  |
Amount of accumulated other comprehensive income (loss) attributable primarily to forward starting interest-rate swaps. | $ (185,728) |  |  |  | $ (185,728) |

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