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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Part 3 (Details) - Cash Flow Hedging [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | $ (264,764) | $ (214,315) | $ (191,952)
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives | (298,133) | (27,410) | 27,115
Commodity Contract |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | (322,648) | (5,699) | 38,819
Commodity Contract | 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 on derivatives | (731,793) | 85,436 | 94,547
Commodity Contract | 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 on derivatives | 473,612 | (19,170) | (44,202)
Interest Rate Contract |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | 57,884 | (208,616) | (230,771)
Interest Rate Contract | 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 on derivatives | $ (39,952) | $ (93,676) | $ (23,230)

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