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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES Part 3 (Details) - Cash Flow Hedging [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | $ (60,428) | $ (74,064) | $ (198,274) | $ (163,601)
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income (loss) on derivatives | (25,853) | 10,429 | (6,171) | 26,777
Commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | (39,056) | 33,334 | 48,139 | 11,709
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 | 53,138 | 23,319 | 98,137 | 47,141
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 | (14,450) | (8,075) | (29,489) | (13,045)
Interest-rate contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | (21,372) | (107,398) | (246,413) | (175,310)
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 | $ (64,541) | $ (4,815) | $ (74,819) | $ (7,319)

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