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FINANCIAL INSTRUMENTS (Schedule of carrying value and estimated fair value of financial assets and liabilities) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financial Assets And Liabilities [Line Items] |  |
Available-for-sale debt securities | $ 8,293 | $ 9,431
Equity securities | 14,512 | 19,374
Equity securities pledged to creditors | 13,032 | 9,007
Derivatives: |  |
Derivative instrument, long-term assets | 3,675 | 3,406
Carrying value | Fair Value, Measurements, Recurring |  |
Financial Assets And Liabilities [Line Items] |  |
Available-for-sale debt securities | 8,293 | 9,431
Equity securities | 1,480 | 10,367
Equity securities pledged to creditors | 13,032 | 9,007
Derivatives: |  |
Derivative instrument, long-term assets | 3,675 | 3,406
Interest rate/currency swap contracts - short-term payables | (1,714) | (1,572)
Interest rate/currency swaps, long-term payables | (21,357) | (32,712)
Carrying value | Fair Value, Measurements, Recurring | Floating rate NOK bonds due 2023 |  |
Financial Assets And Liabilities [Line Items] |  |
Long-term debt | (81,238) | (81,572)
Carrying value | Fair Value, Measurements, Recurring | Floating rate NOK bonds due 2024 |  |
Financial Assets And Liabilities [Line Items] |  |
Long-term debt | (80,657) | (80,989)
Carrying value | Fair Value, Measurements, Recurring | Floating rate NOK bonds due 2025 |  |
Financial Assets And Liabilities [Line Items] |  |
Long-term debt | (62,669) | (62,927)
Carrying value | Fair Value, Measurements, Recurring | 5.75% senior unsecured convertible notes due 2021 |  |
Financial Assets And Liabilities [Line Items] |  |
Long-term debt | (146,919) | (212,230)
Carrying value | Fair Value, Measurements, Recurring | 4.875% senior unsecured convertible notes due 2023 |  |
Financial Assets And Liabilities [Line Items] |  |
Long-term debt | (137,900) | (139,900)
Carrying value | Fair Value, Measurements, Recurring | 7.25% senior unsecured sustainability-linked bonds due 2026 |  |
Financial Assets And Liabilities [Line Items] |  |
Long-term debt | (150,000) | 0
Fair value | Fair Value, Measurements, Recurring |  |
Financial Assets And Liabilities [Line Items] |  |
Available-for-sale debt securities | 8,293 | 9,431
Equity securities | 1,480 | 10,367
Equity securities pledged to creditors | 13,032 | 9,007
Derivatives: |  |
Derivative instrument, long-term assets | 3,675 | 3,406
Interest rate/currency swap contracts - short-term payables | (1,714) | (1,572)
Interest rate/currency swaps, long-term payables | (21,357) | (32,712)
Fair value | Fair Value, Measurements, Recurring | Floating rate NOK bonds due 2023 |  |
Financial Assets And Liabilities [Line Items] |  |
Long-term debt | (80,831) | (78,513)
Fair value | Fair Value, Measurements, Recurring | Floating rate NOK bonds due 2024 |  |
Financial Assets And Liabilities [Line Items] |  |
Long-term debt | (80,052) | (76,940)
Fair value | Fair Value, Measurements, Recurring | Floating rate NOK bonds due 2025 |  |
Financial Assets And Liabilities [Line Items] |  |
Long-term debt | (60,632) | (57,421)
Fair value | Fair Value, Measurements, Recurring | 5.75% senior unsecured convertible notes due 2021 |  |
Financial Assets And Liabilities [Line Items] |  |
Long-term debt | (145,450) | (199,496)
Fair value | Fair Value, Measurements, Recurring | 4.875% senior unsecured convertible notes due 2023 |  |
Financial Assets And Liabilities [Line Items] |  |
Long-term debt | (137,470) | (123,112)
Fair value | Fair Value, Measurements, Recurring | 7.25% senior unsecured sustainability-linked bonds due 2026 |  |
Financial Assets And Liabilities [Line Items] |  |
Long-term debt | $ (151,125) | $ 0

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