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Financial Instruments - Carrying Values and Estimated Fair Values (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Non-Derivatives:        
Cash and cash equivalents $ 732,062 $ 727,133 $ 679,225 $ 878,838
Trade accounts receivable 28,258   38,915  
Current portion of long-term debt and short-term debt (345,930)   (342,566)  
Long-term debt (1,076,469)   (874,164)  
Derivatives:        
Deposits, money market deposits 505,300   481,700  
Interest income, money market deposits 18,600 $ 26,600    
Less: Deferred financing costs 24,480   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 732,062   679,225  
Restricted cash and short-term deposits 92,025   92,245  
Trade accounts receivable 28,258   38,915  
Money market funds 3,191   3,929  
Trade accounts payable (73,695)   (7,454)  
Unsecured long-term debt, noncurrent (189,623)   (199,869)  
Carrying value | Level 1 | Interest rate swap        
Non-Derivatives:        
Receivable from TTF linked commodity swap derivatives 2,124   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 (349,522)   (343,781)  
Long-term debt (907,734)   (696,933)  
Carrying value | Level 2 | Oil and gas derivative        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 20) 107,806   159,611  
Carrying value | Level 2 | Interest rate swap        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 20) 25,383   39,387  
Carrying value | Level 2 | Commodity contract        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 20) 12,291   48,079  
Fair value | Level 1        
Non-Derivatives:        
Cash and cash equivalents, fair value 732,062   679,225  
Restricted cash and short-term deposits, fair value 92,025   92,245  
Trade accounts receivable, fair value 28,258   38,915  
Money market funds, fair value 3,191   3,929  
Trade accounts payable, fair value (73,695)   (7,454)  
Unsecured long-term debt, noncurrent, fair value (191,595)   (197,906)  
Fair value | Level 1 | Interest rate swap        
Non-Derivatives:        
Other receivables, fair value disclosure 2,124   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 (349,522)   (343,781)  
Long-term debt, fair value (907,734)   (696,933)  
Fair value | Level 2 | Oil and gas derivative        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 20) 107,806   159,611  
Fair value | Level 2 | Interest rate swap        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 20) 25,383   39,387  
Fair value | Level 2 | Commodity contract        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 20) $ 12,291   $ 48,079