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FINANCIAL INSTRUMENTS (Schedule of Carrying Value and Estimated Fair Value of Financial Assets and Liabilities) (Details)
$ in Thousands
Jun. 30, 2025
USD ($)
Jun. 30, 2025
NOK (kr)
Dec. 31, 2024
USD ($)
Apr. 30, 2024
USD ($)
Derivatives [Abstract]        
Total derivative instruments - short-term assets $ 0   $ 121  
Total derivative instruments - long-term assets $ 15,223   15,523  
7.25% senior unsecured sustainability-linked bonds due 2026        
Non-Derivatives [Abstract]        
Senior unsecured convertible notes interest rate (in percentage) 7.25% 7.25%    
8.875% senior unsecured sustainability-linked bonds due 2027        
Non-Derivatives [Abstract]        
Senior unsecured convertible notes interest rate (in percentage) 8.875% 8.875%    
8.25% senior unsecured sustainability-linked bonds due 2028        
Non-Derivatives [Abstract]        
Senior unsecured convertible notes interest rate (in percentage) 8.25% 8.25%   8.25%
NOK750 million senior unsecured floating rate bonds due 2029        
Non-Derivatives [Abstract]        
U.S. dollar floating rate debt | kr   kr 750,000,000    
7.75% senior unsecured sustainability-linked bonds due 2030        
Non-Derivatives [Abstract]        
Senior unsecured convertible notes interest rate (in percentage) 7.75% 7.75%   7.75%
U.S. dollar floating rate debt       $ 150,000
Long-term debt $ 144,400   0  
Carrying value | Fair value, measurements, recurring        
Non-Derivatives [Abstract]        
Equity securities 2,859   3,736  
Derivatives [Abstract]        
Total derivative instruments - short-term assets 0   121  
Total derivative instruments - long-term assets 15,223   15,523  
Interest rate/ currency/ commodity swap contracts - short-term payables 0   14,884  
Interest rate/ currency/ commodity swap contracts - long-term payables 6,529   103  
Carrying value | Fair value, measurements, recurring | 7.25% senior unsecured sustainability-linked bonds due 2026        
Non-Derivatives [Abstract]        
Long-term debt 150,000   150,000  
Carrying value | Fair value, measurements, recurring | 8.875% senior unsecured sustainability-linked bonds due 2027        
Non-Derivatives [Abstract]        
Long-term debt 150,000   150,000  
Carrying value | Fair value, measurements, recurring | 8.25% senior unsecured sustainability-linked bonds due 2028        
Non-Derivatives [Abstract]        
Long-term debt 147,600   145,200  
Carrying value | Fair value, measurements, recurring | NOK750 million senior unsecured floating rate bonds due 2029        
Non-Derivatives [Abstract]        
Long-term debt 74,391   63,592  
Carrying value | Fair value, measurements, recurring | 7.75% senior unsecured sustainability-linked bonds due 2030        
Non-Derivatives [Abstract]        
Long-term debt 144,400   0  
Fair value | Fair value, measurements, recurring        
Non-Derivatives [Abstract]        
Equity securities 2,859   3,736  
Derivatives [Abstract]        
Total derivative instruments - short-term assets 0   121  
Total derivative instruments - long-term assets 15,223   15,523  
Interest rate/ currency/ commodity swap contracts - short-term payables 0   14,884  
Interest rate/ currency/ commodity swap contracts - long-term payables 6,529   103  
Fair value | Fair value, measurements, recurring | 7.25% senior unsecured sustainability-linked bonds due 2026        
Non-Derivatives [Abstract]        
Long-term debt 150,750   150,975  
Fair value | Fair value, measurements, recurring | 8.875% senior unsecured sustainability-linked bonds due 2027        
Non-Derivatives [Abstract]        
Long-term debt 153,375   154,737  
Fair value | Fair value, measurements, recurring | 8.25% senior unsecured sustainability-linked bonds due 2028        
Non-Derivatives [Abstract]        
Long-term debt 150,552   149,874  
Fair value | Fair value, measurements, recurring | NOK750 million senior unsecured floating rate bonds due 2029        
Non-Derivatives [Abstract]        
Long-term debt 74,510   63,778  
Fair value | Fair value, measurements, recurring | 7.75% senior unsecured sustainability-linked bonds due 2030        
Non-Derivatives [Abstract]        
Long-term debt $ 144,581   $ 0