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FINANCIAL INSTRUMENTS - Fair Values of Derivative Instruments on a Gross Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017
--- | --- | --- | ---
Derivative [Line Items] |  |  |
Derivative asset | $ 540 | $ 46,970 |
Derivative liability | (45,625) | (56,205) |
Oil derivative instrument |  |  |
Derivative [Line Items] |  |  |
Derivative asset | 540 | 45,640 |
Derivative liability |  |  | $ (79,600)
Foreign exchange swap |  |  |
Derivative [Line Items] |  |  |
Derivative asset | 0 | 214 |
Foreign exchange swaps | 0 | 1,246 |
Net amount | (1,310) | 0 |
Interest rate swap |  |  |
Derivative [Line Items] |  |  |
Derivative asset | 0 | 84 |
Derivative liability | (44,315) | (5,798) |
Equity Swap |  |  |
Derivative [Line Items] |  |  |
Derivative liability | $ 0 | $ (50,407) |

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