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FINANCIAL INSTRUMENTS - Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017
--- | --- | --- | ---
Derivatives: |  |  |
Derivative asset | $ 540 | $ 46,970 |
Derivative liability | (45,625) | (56,205) |
Debt deferred charges | 28,749 | 32,924 |
Oil derivative instrument |  |  |
Derivatives: |  |  |
Derivative asset | 540 | 45,640 |
Derivative liability |  |  | $ (79,600)
Interest rate swap |  |  |
Derivatives: |  |  |
Derivative asset | 0 | 84 |
Derivative liability | (44,315) | (5,798) |
Foreign exchange swap |  |  |
Derivatives: |  |  |
Derivative asset | 0 | 214 |
Foreign exchange swaps | 0 | 1,246 |
Net amount | (1,310) | 0 |
Equity Swap |  |  |
Derivatives: |  |  |
Derivative liability | 0 | (50,407) |
Level 1 | Carrying value |  |  |
Non-derivatives: |  |  |
Cash and cash equivalents | 127,691 | 222,123 |
Restricted cash and short-term deposits | 163,181 | 188,289 |
Level 1 | Fair value |  |  |
Non-derivatives: |  |  |
Cash and cash equivalents | 127,691 | 222,123 |
Restricted cash and short-term deposits | 163,181 | 188,289 |
Level 2 | Carrying value |  |  |
Non-derivatives: |  |  |
Current portion of long-term debt and short-term debt | (984,510) | (1,244,599) |
Long-term debt - convertible bonds | (383,740) | (368,134) |
Long-term debt | (1,011,281) | (956,018) |
Level 2 | Carrying value | Oil derivative instrument |  |  |
Derivatives: |  |  |
Derivative asset | 540 | 45,640 |
Level 2 | Carrying value | Interest rate swap |  |  |
Derivatives: |  |  |
Derivative asset | 0 | 84 |
Derivative liability | (44,315) | (5,798) |
Level 2 | Carrying value | Foreign exchange swap |  |  |
Derivatives: |  |  |
Foreign exchange swaps | 0 | 1,246 |
Net amount | (1,310) | 0 |
Level 2 | Carrying value | Equity Swap |  |  |
Derivatives: |  |  |
Derivative liability | 0 | (50,407) |
Level 2 | Fair value |  |  |
Non-derivatives: |  |  |
Current portion of long-term debt and short-term debt | (984,510) | (1,244,599) |
Long-term debt - convertible bonds | (366,581) | (355,943) |
Long-term debt | (1,011,281) | (956,018) |
Level 2 | Fair value | Oil derivative instrument |  |  |
Derivatives: |  |  |
Derivative asset | 540 | 45,640 |
Level 2 | Fair value | Interest rate swap |  |  |
Derivatives: |  |  |
Derivative asset | 0 | 84 |
Derivative liability | (44,315) | (5,798) |
Level 2 | Fair value | Foreign exchange swap |  |  |
Derivatives: |  |  |
Foreign exchange swaps | 0 | 1,246 |
Net amount | (1,310) | 0 |
Level 2 | Fair value | Equity Swap |  |  |
Derivatives: |  |  |
Derivative liability | $ 0 | $ (50,407) |

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