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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES Part 3 (Details) - Cash Flow Hedging [Member] - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | $ 42,855 | $ (137,846)
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income (loss) on derivatives | (53,748) | 19,682
Commodity Contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | (63,430) | 87,195
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 | (130,518) | 44,999
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 | 86,436 | (15,039)
Interest Rate Contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | 106,285 | (225,041)
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 | $ (9,666) | $ (10,278)

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