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FINANCIAL INSTRUMENTS - Fair Value Hierarchy (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Non-derivatives:      
Cash and cash equivalents, carrying value $ 109,206 $ 165,274 $ 84,362
Trade accounts and other receivables, carrying value 2,917 1,838  
Current portion of long-term debt and short-term debt, carrying value (77,803) (141,996)  
Long-term debt, carrying value (1,307,518) (1,163,879)  
Derivatives:      
Debt issuance costs 15,700 15,800  
Level 1 | Carrying value      
Non-derivatives:      
Cash and cash equivalents, carrying value 109,206 165,274  
Restricted cash, carrying value 502 446  
Trade accounts and other receivables, carrying value 2,917 1,838  
Trade accounts payable, carrying value (8,463) (19,608)  
EU ETS obligation, carrying value (3,606) (2,313)  
Level 1 | Fair value      
Non-derivatives:      
Cash and cash equivalents, fair value 109,206 165,274  
Restricted cash, fair value 502 446  
Trade accounts and other receivables, fair value 2,917 1,838  
Trade accounts payable, fair value (8,463) (19,608)  
EU ETS obligation, fair value (3,606) (2,313)  
Level 2 | Carrying value      
Non-derivatives:      
Current portion of long-term debt and short-term debt, carrying value (79,255) (143,328)  
Long-term debt, carrying value (1,321,803) (1,178,361)  
Derivatives:      
Interest rate swaps asset 2,140 7,676  
Interest rate swap liabilities 3,285 0  
Level 2 | Fair value      
Non-derivatives:      
Current portion of long-term debt and short-term debt, fair value (79,255) (143,328)  
Long-term debt, fair value (1,321,803) (1,178,361)  
Derivatives:      
Interest rate swaps asset 2,140 7,676  
Interest rate swap liabilities $ 3,285 $ 0