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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES Part 3 (Details) - Cash Flow Hedging [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | $ (20,454) | $ (95,872) | $ (218,728) | $ (259,474)
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income (loss) on derivatives | (8,399) | 11,625 | (14,570) | 38,402
Commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | (29,667) | 32,169 | 18,472 | 43,877
Commodity contracts | Commodity sales revenues |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income (loss) on derivatives | 2,167 | 38,234 | 100,304 | 85,375
Commodity contracts | Cost of sales and fuel |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income (loss) on derivatives | (1,568) | (19,706) | (31,057) | (32,751)
Interest-rate contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | 9,213 | (128,041) | (237,200) | (303,351)
Interest-rate contracts | Interest expense |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income (loss) on derivatives | $ (8,998) | $ (6,903) | $ (83,817) | $ (14,222)

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