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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, 2022
Dec. 31, 2021
Non-derivatives:    
Available-for-sale debt securities $ 6,315 $ 9,680
Equity securities 14,419 11,530
Equity securities pledged to creditors 12,830 10,238
Derivatives:    
Total derivative instruments - short-term assets 792 0
Total derivative instruments - long-term assets $ 19,972 3,184
4.875% senior unsecured convertible notes due 2023    
Non-derivatives:    
Senior unsecured convertible notes interest rate (in percentage) 4.875%  
7.25% senior unsecured sustainability-linked bonds due 2026    
Non-derivatives:    
Senior unsecured convertible notes interest rate (in percentage) 7.25%  
Carrying value | Fair value, measurements, recurring    
Non-derivatives:    
Available-for-sale debt securities $ 6,315 9,680
Equity securities 1,589 1,292
Equity securities pledged to creditors 12,830 10,238
Derivatives:    
Total derivative instruments - short-term assets 792 0
Total derivative instruments - long-term assets 19,972 3,184
Interest rate/currency swap contracts - short-term payables 13 738
Interest rate/currency swaps, long-term payables 33,559 17,209
Carrying value | Fair value, measurements, recurring | NOK700 million senior unsecured floating rate bonds due 2023    
Non-derivatives:    
Long-term debt 70,930 79,507
Carrying value | Fair value, measurements, recurring | NOK700 million senior unsecured floating rate bonds due 2024    
Non-derivatives:    
Long-term debt 70,423 78,939
Carrying value | Fair value, measurements, recurring | NOK600 million senior unsecured floating rate bonds due 2025    
Non-derivatives:    
Long-term debt 54,717 61,334
Carrying value | Fair value, measurements, recurring | 4.875% senior unsecured convertible notes due 2023    
Non-derivatives:    
Long-term debt 137,900 137,900
Carrying value | Fair value, measurements, recurring | 7.25% senior unsecured sustainability-linked bonds due 2026    
Non-derivatives:    
Long-term debt 150,000 150,000
Fair value | Fair value, measurements, recurring    
Non-derivatives:    
Available-for-sale debt securities 6,315 9,680
Equity securities 1,589 1,292
Equity securities pledged to creditors 12,830 10,238
Derivatives:    
Total derivative instruments - short-term assets 792 0
Total derivative instruments - long-term assets 19,972 3,184
Interest rate/currency swap contracts - short-term payables 13 738
Interest rate/currency swaps, long-term payables 33,559 17,209
Fair value | Fair value, measurements, recurring | NOK700 million senior unsecured floating rate bonds due 2023    
Non-derivatives:    
Long-term debt 71,462 79,586
Fair value | Fair value, measurements, recurring | NOK700 million senior unsecured floating rate bonds due 2024    
Non-derivatives:    
Long-term debt 70,923 79,077
Fair value | Fair value, measurements, recurring | NOK600 million senior unsecured floating rate bonds due 2025    
Non-derivatives:    
Long-term debt 54,444 60,133
Fair value | Fair value, measurements, recurring | 4.875% senior unsecured convertible notes due 2023    
Non-derivatives:    
Long-term debt 139,555 138,727
Fair value | Fair value, measurements, recurring | 7.25% senior unsecured sustainability-linked bonds due 2026    
Non-derivatives:    
Long-term debt $ 140,625 $ 153,563