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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES Part 3 (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Cash Flow Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | $ (95,872) | $ (4,580) | $ (259,474) | $ 13,933
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income | 11,625 | (25,013) | 38,402 | (56,359)
Commodity contracts | Cash Flow Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | 32,169 | (30,783) | 43,877 | (56,246)
Commodity contracts | Commodity sales revenues/ cost of sales and fuel | Cash Flow Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income |  | (20,630) |  | (42,430)
Interest Rate Contract [Member] | Cash Flow Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | (128,041) | 26,203 | (303,351) | 70,179
Interest Rate Contract [Member] | Interest expense | Cash Flow Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income |  | (4,383) |  | (13,929)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Commodity contracts | Commodity sales revenues/ 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 | 18,528 | (20,630) | 52,624 | (42,430)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Interest Rate Contract [Member] | 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 | $ (6,903) | $ (4,383) | $ (14,222) | $ (13,929)

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