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FINANCIAL INSTRUMENTS (Schedule of financial assets and liabilities measured at fair value on a recurring basis) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair value | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | $ 8,293 | $ 9,431
Equity securities | 1,480 | 10,367
Equity securities pledged to creditors | 13,032 | 9,007
Derivative instrument, long-term assets | 3,675 | 3,406
Total assets | 26,480 |
Liabilities: |  |
Floating rate NOK bonds due 2023 | (80,831) |
Floating rate NOK bonds due 2024 | (80,052) |
Floating rate NOK bonds due 2025 | (60,632) |
Interest rate/currency swaps, short-term payables | (1,714) |
Interest rate/currency swaps, long-term payables | (21,357) | (32,712)
Total liabilities | (678,631) |
Fair value | Fair Value, Measurements, Recurring | 5.75% senior unsecured convertible notes due 2021 |  |
Liabilities: |  |
Convertible Debt, Fair Value Disclosures | (145,450) |
Fair value | Fair Value, Measurements, Recurring | 4.875% senior unsecured convertible notes due 2023 |  |
Liabilities: |  |
Convertible Debt, Fair Value Disclosures | (137,470) |
Fair value | Fair Value, Measurements, Recurring | 7.25% senior unsecured sustainability-linked bonds due 2026 |  |
Liabilities: |  |
Convertible Debt, Fair Value Disclosures | (151,125) |
Fair value | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for identical Assets/Liabilities (Level 1) |  |
Assets: |  |
Available-for-sale debt securities | 4,620 |
Equity securities | 1,480 |
Equity securities pledged to creditors | 13,032 |
Total assets | 19,132 |
Liabilities: |  |
Floating rate NOK bonds due 2023 | (80,831) |
Floating rate NOK bonds due 2024 | (80,052) |
Floating rate NOK bonds due 2025 | (60,632) |
Total liabilities | (655,560) |
Fair value | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for identical Assets/Liabilities (Level 1) | 5.75% senior unsecured convertible notes due 2021 |  |
Liabilities: |  |
Convertible Debt, Fair Value Disclosures | (145,450) |
Fair value | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for identical Assets/Liabilities (Level 1) | 4.875% senior unsecured convertible notes due 2023 |  |
Liabilities: |  |
Convertible Debt, Fair Value Disclosures | (137,470) |
Fair value | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for identical Assets/Liabilities (Level 1) | 7.25% senior unsecured sustainability-linked bonds due 2026 |  |
Liabilities: |  |
Convertible Debt, Fair Value Disclosures | (151,125) |
Fair value | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Available-for-sale debt securities | 3,673 | 4,800
Derivative instrument, long-term assets | 3,675 |
Total assets | 7,348 |
Liabilities: |  |
Interest rate/currency swaps, short-term payables | (1,714) |
Interest rate/currency swaps, long-term payables | (21,357) |
Total liabilities | (23,071) |
Fair value | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Total assets | 0 |
Liabilities: |  |
Total liabilities | 0 |
Carrying value | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | 8,293 | 9,431
Equity securities | 1,480 | 10,367
Equity securities pledged to creditors | 13,032 | 9,007
Derivative instrument, long-term assets | 3,675 | 3,406
Liabilities: |  |
Interest rate/currency swaps, long-term payables | (21,357) | (32,712)
Available-for-sale debt securities | 8,293 | 9,431
Equity securities | 14,512 | 19,374
Equity securities pledged to creditors | 13,032 | 9,007
Derivative instrument, long-term assets | $ 3,675 | $ 3,406

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