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FINANCIAL INSTRUMENTS - Fair Value Hierarchy (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Non-Derivatives:        
Cash and cash equivalents $ 566,384 $ 679,225 $ 878,838 $ 231,849
Trade accounts receivable 29,667 38,915    
Current portion of long-term debt and short-term debt, carrying value (521,282) (342,566)    
Long-term debt, carrying value (930,973) (874,164)    
Derivatives:        
Deposits, money market deposits 301,800 481,700    
Interest income, money market deposits 35,300 44,100    
Deferred finance charges 22,686 23,853    
Gimi conversion        
Non-Derivatives:        
Trade accounts payable, carrying value (80,900) (1,100)    
Engineering, Procurement and Construction Agreement. MKII EPC        
Non-Derivatives:        
Trade accounts payable, carrying value (100,200) (1,100)    
Interest rate swap        
Non-Derivatives:        
Interest receivable 1,745 2,461    
Commodity contract        
Non-Derivatives:        
Receivable from TTF linked commodity swap derivatives 0 7,581    
Level 1 | Carrying value        
Non-Derivatives:        
Cash and cash equivalents 566,384 679,225    
Restricted cash and short-term deposits, carrying value 150,198 92,245    
Trade accounts receivable 29,667 38,915    
Money market funds, at carrying value 2,053 3,929    
Receivable from TTF linked commodity swap derivatives 0 7,581    
Interest receivable 1,745 2,461    
Trade accounts payable, carrying value (198,906) (7,454)    
Current portion of long-term debt, carrying value (189,642) 0    
Unsecured long-term debt, noncurrent 0 (199,869)    
Level 1 | Fair value        
Non-Derivatives:        
Cash and cash equivalents, fair value 566,384 679,225    
Restricted cash and short-term deposits, fair value 150,198 92,245    
Trade accounts receivable, fair value 29,667 38,915    
Money market funds, fair value 2,053 3,929    
Other receivables, fair value disclosure 0 7,581    
Interest receivable, fair value 1,745 2,461    
Trade accounts payable, fair value (198,906) (7,454)    
Current portion of long-term debt, fair value (191,147) 0    
Unsecured long-term debt, noncurrent, fair value 0 (197,906)    
Level 2 | Carrying value        
Non-Derivatives:        
Current portion of long-term debt and short-term debt, carrying value (337,299) (343,781)    
Long-term debt, carrying value (948,000) (696,933)    
Level 2 | Fair value        
Non-Derivatives:        
Current portion of long-term debt and short-term debt, fair value (337,299) (343,781)    
Long-term debt, fair value (948,000) (696,933)    
Level 2 | Energy related derivative | Carrying value        
Derivatives:        
Derivative asset 105,828 159,611    
Level 2 | Energy related derivative | Fair value        
Derivatives:        
Derivative asset 105,828 159,611    
Level 2 | Interest rate swap | Carrying value        
Derivatives:        
Derivative asset 33,417 39,387    
Level 2 | Interest rate swap | Fair value        
Derivatives:        
Derivative asset 33,417 39,387    
Level 2 | Commodity contract | Carrying value        
Derivatives:        
Derivative asset 0 48,079    
Level 2 | Commodity contract | Fair value        
Derivatives:        
Derivative asset $ 0 $ 48,079