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Financial Instruments - Carrying Values and Estimated Fair Values (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Non-Derivatives:        
Cash and cash equivalents $ 727,133 $ 498,056 $ 878,838 $ 231,849
Trade accounts receivable 34,832   41,545  
Investment in listed equity securities 0   224,788  
Current portion of long-term debt and short-term debt (327,169)   (344,778)  
Long-term debt (850,443)   (844,546)  
Derivatives:        
Deposits, money market deposits 635,700   634,200  
Interest income, money market deposits 26,600 $ 2,300    
Less: Deferred financing costs 24,941   20,955  
Commodity contract        
Non-Derivatives:        
Receivable from TTF linked commodity swap derivatives 7,581   4,638  
Carrying value | Level 1        
Non-Derivatives:        
Cash and cash equivalents 727,133   878,838  
Restricted cash and short-term deposits 132,462   134,043  
Trade accounts receivable 34,832   41,545  
Money market funds 5,428   3,617  
Equity securities 0   224,788  
Trade accounts payable (14,829)   (8,983)  
Unsecured long-term debt, noncurrent (138,725)   (159,029)  
Carrying value | Level 1 | Interest rate swap        
Non-Derivatives:        
Receivable from TTF linked commodity swap derivatives 2,280   1,923  
Carrying value | Level 1 | Commodity contract        
Non-Derivatives:        
Receivable from TTF linked commodity swap derivatives 7,581   4,638  
Carrying value | Level 2        
Non-Derivatives:        
Assets held for sale (note 11) 14,979   721  
Liabilities held for sale 0   (373)  
Current portion of long-term debt and short-term debt (328,043)   (344,960)  
Long-term debt (735,785)   (706,290)  
Carrying value | Level 2 | Oil and gas derivative        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 21) 264,869   378,979  
Carrying value | Level 2 | Interest rate swap        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 21) 58,277   54,970  
Carrying value | Level 2 | Commodity contract        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 21) 69,729   113,368  
Fair value | Level 1        
Non-Derivatives:        
Cash and cash equivalents, fair value 727,133   878,838  
Restricted cash and short-term deposits, fair value 132,462   134,043  
Trade accounts receivable, fair value 34,832   41,545  
Money market funds, fair value 5,428   3,617  
Investment in listed equity securities 0   224,788  
Trade accounts payable, fair value (14,829)   (8,983)  
Unsecured long-term debt, noncurrent, fair value (136,644)   (158,092)  
Fair value | Level 1 | Interest rate swap        
Non-Derivatives:        
Other receivables, fair value disclosure 2,280   1,923  
Fair value | Level 1 | Commodity contract        
Non-Derivatives:        
Other receivables, fair value disclosure 7,581   4,638  
Fair value | Level 2        
Non-Derivatives:        
Assets held for sale (note 11) 14,979   721  
Liabilities held for sale, fair value 0   (373)  
Current portion of long-term debt and short-term debt, fair value (328,043)   (344,960)  
Long-term debt, fair value (735,785)   (706,290)  
Fair value | Level 2 | Oil and gas derivative        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 21) 264,869   378,979  
Fair value | Level 2 | Interest rate swap        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 21) 58,277   54,970  
Fair value | Level 2 | Commodity contract        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 21) $ 69,729   $ 113,368