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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, 2020 | Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | $ (137,846) | $ (89,537)
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income (loss) on derivatives | 19,682 | 16,348
Commodity contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | 87,195 | (21,625)
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 | 44,999 | 23,822
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 | (15,039) | (4,970)
Interest Rate Contract |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | (225,041) | (67,912)
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 (loss) on derivatives | $ (10,278) | $ (2,504)

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