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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | $ (214,315) | $ (191,952) | $ (7,367)
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives | (27,410) | 27,115 | (47,883)
Commodity Contract |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | (5,699) | 38,819 | 53,217
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 | 85,436 | 94,547 | (37,596)
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 | (19,170) | (44,202) | 8,000
Interest Rate Contract |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | (208,616) | (230,771) | (60,584)
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 | $ (93,676) | $ (23,230) | $ (18,287)

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