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Financial Instruments - Carrying Values and Estimated Fair Values (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Non-Derivatives:        
Cash and cash equivalents $ 527,591 $ 770,567 $ 679,225 $ 878,838
Trade accounts receivable 31,511   38,915  
Current portion of long-term debt and short-term debt (353,334)   (342,566)  
Long-term debt (820,258)   (874,164)  
Derivatives:        
Deposits, money market deposits 445,900   481,700  
Interest income, money market deposits 13,400 $ 17,800    
Less: Deferred financing costs 20,711   23,853  
Commodity contract        
Non-Derivatives:        
Receivable from TTF linked commodity swap derivatives 0   7,581  
Carrying value | Level 1        
Non-Derivatives:        
Cash and cash equivalents 527,591   679,225  
Restricted cash and short-term deposits 93,930   92,245  
Trade accounts receivable 31,511   38,915  
Money market funds 4,059   3,929  
Trade accounts payable (88,985)   (7,454)  
Unsecured long-term debt, noncurrent (199,905)   (199,869)  
Carrying value | Level 1 | Interest rate swap        
Non-Derivatives:        
Receivable from TTF linked commodity swap derivatives 2,340   2,461  
Carrying value | Level 1 | Commodity contract        
Non-Derivatives:        
Receivable from TTF linked commodity swap derivatives 0   7,581  
Carrying value | Level 2        
Non-Derivatives:        
Current portion of long-term debt and short-term debt (356,931)   (343,781)  
Long-term debt (637,467)   (696,933)  
Carrying value | Level 2 | Oil and gas derivative        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 20) 169,408   159,611  
Carrying value | Level 2 | Interest rate swap        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 20) 41,142   39,387  
Carrying value | Level 2 | Commodity contract        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 20) 24,378   48,079  
Fair value | Level 1        
Non-Derivatives:        
Cash and cash equivalents, fair value 527,591   679,225  
Restricted cash and short-term deposits, fair value 93,930   92,245  
Trade accounts receivable, fair value 31,511   38,915  
Money market funds, fair value 4,059   3,929  
Trade accounts payable, fair value (88,985)   (7,454)  
Unsecured long-term debt, noncurrent, fair value (199,184)   (197,906)  
Fair value | Level 1 | Interest rate swap        
Non-Derivatives:        
Other receivables, fair value disclosure 2,340   2,461  
Fair value | Level 1 | Commodity contract        
Non-Derivatives:        
Other receivables, fair value disclosure 0   7,581  
Fair value | Level 2        
Non-Derivatives:        
Current portion of long-term debt and short-term debt, fair value (356,931)   (343,781)  
Long-term debt, fair value (637,467)   (696,933)  
Fair value | Level 2 | Oil and gas derivative        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 20) 169,408   159,611  
Fair value | Level 2 | Interest rate swap        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 20) 41,142   39,387  
Fair value | Level 2 | Commodity contract        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 20) $ 24,378   $ 48,079