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FINANCIAL INSTRUMENTS - Fair Value Hierarchy (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Non-Derivatives:        
Cash and cash equivalents $ 679,225 $ 878,838 $ 231,849 $ 85,996
Trade accounts receivable 38,915 41,545    
Investment in listed equity securities (note 9) 0 224,788    
Current portion of long-term debt and short-term debt, carrying value (342,566) (344,778)    
Long-term debt, carrying value (874,164) (844,546)    
Derivatives:        
Deposits, money market deposits 481,700 634,200    
Interest income, money market deposits 33,800 7,600    
Deferred finance charges 23,853 20,955    
Interest rate swap        
Non-Derivatives:        
Interest receivable 2,461 1,923    
Commodity contract        
Non-Derivatives:        
Receivable from TTF linked commodity swap derivatives 7,581 4,638    
Derivatives:        
Mark-to-market derivative valuation 48,079 73,583    
Level 1 | Carrying value        
Non-Derivatives:        
Cash and cash equivalents 679,225 878,838    
Restricted cash and short-term deposits, carrying value 92,245 134,043    
Trade accounts receivable 38,915 41,545    
Money market funds, at carrying value 3,929 3,617    
Receivable from TTF linked commodity swap derivatives 7,581 4,638    
Interest receivable 2,461 1,923    
Investment in listed equity securities, carrying value 0 224,788    
Trade accounts payable, carrying value (7,454) (8,983)    
Unsecured long-term debt, noncurrent (199,869) (159,029)    
Level 1 | Fair value        
Non-Derivatives:        
Cash and cash equivalents, fair value 679,225 878,838    
Restricted cash and short-term deposits, fair value 92,245 134,043    
Trade accounts receivable, fair value 38,915 41,545    
Money market funds, fair value 3,929 3,617    
Other receivables, fair value disclosure 7,581 4,638    
Interest receivable, fair value 2,461 1,923    
Investment in listed equity securities (note 9) 0 224,788    
Trade accounts payable, fair value (7,454) (8,983)    
Unsecured long-term debt, noncurrent, fair value (197,906) (158,092)    
Level 2 | Carrying value        
Non-Derivatives:        
Assets held for sale 0 721    
Liabilities held for sale 0 (373)    
Current portion of long-term debt and short-term debt, carrying value (343,781) (344,960)    
Long-term debt, carrying value (696,933) (706,290)    
Level 2 | Carrying value | Energy related derivative        
Derivatives:        
Mark-to-market derivative valuation 159,611 378,979    
Level 2 | Carrying value | Interest rate swap        
Derivatives:        
Mark-to-market derivative valuation 39,387 54,970    
Level 2 | Carrying value | Commodity contract        
Derivatives:        
Mark-to-market derivative valuation 48,079 113,368    
Level 2 | Fair value        
Non-Derivatives:        
Assets held-for-sale, fair value 0 721    
Liabilities held for sale, fair value 0 (373)    
Current portion of long-term debt and short-term debt, fair value (343,781) (344,960)    
Long-term debt, fair value (696,933) (706,290)    
Level 2 | Fair value | Energy related derivative        
Derivatives:        
Mark-to-market derivative valuation 159,611 378,979    
Level 2 | Fair value | Interest rate swap        
Derivatives:        
Mark-to-market derivative valuation 39,387 54,970    
Level 2 | Fair value | Commodity contract        
Derivatives:        
Mark-to-market derivative valuation $ 48,079 $ 113,368