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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