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Financial Instruments - Carrying Values and Estimated Fair Values (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Non-Derivatives:        
Cash and cash equivalents $ 770,567 $ 528,612 $ 878,838 $ 231,849
Trade accounts receivable 37,605   41,545  
Investment in listed equity securities 0   224,788  
Current portion of long-term debt and short-term debt (321,928)   (344,778)  
Long-term debt (867,350)   (844,546)  
Derivatives:        
Deposits, money market deposits 668,700 420,200 634,200  
Interest income, money market deposits 17,800 $ 400    
Less: Deferred financing costs (2) 29,672   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 770,567   878,838  
Restricted cash and short-term deposits 132,219   134,043  
Trade accounts receivable 37,605   41,545  
Money market funds 4,950   3,617  
Equity securities 0   224,788  
Trade accounts payable (16,300)   (8,983)  
Assets held for sale (note 11) 14,979   0  
Carrying value | Level 1 | Interest rate swap        
Non-Derivatives:        
Receivable from TTF linked commodity swap derivatives 2,461   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) 0   721  
Liabilities held for sale (note 11) 0   (373)  
Current portion of long-term debt and short-term debt (322,902)   (344,960)  
Long-term debt (757,342)   (706,290)  
Unsecured long-term debt, noncurrent (138,706)   (159,029)  
Carrying value | Level 2 | Oil and gas derivative        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 21) 209,497   378,979  
Carrying value | Level 2 | Interest rate swap        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 21) 53,517   54,970  
Carrying value | Level 2 | Commodity contract        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 21) 91,193   113,368  
Fair value | Level 1        
Non-Derivatives:        
Cash and cash equivalents, fair value 770,567   878,838  
Restricted cash and short-term deposits, fair value 132,219   134,043  
Trade accounts receivable, fair value 37,605   41,545  
Money market funds, fair value 4,950   3,617  
Investment in listed equity securities 0   224,788  
Trade accounts payable, fair value (16,300)   (8,983)  
Assets held for sale (note 11) 14,979   0  
Fair value | Level 1 | Interest rate swap        
Non-Derivatives:        
Other receivables, fair value disclosure 2,461   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) 0   721  
Liabilities held for sale, fair value 0   (373)  
Current portion of long-term debt and short-term debt, fair value (322,902)   (344,960)  
Long-term debt, fair value (757,342)   (706,290)  
Unsecured long-term debt, noncurrent, fair value (134,802)   (158,092)  
Fair value | Level 2 | Oil and gas derivative        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 21) 209,497   378,979  
Fair value | Level 2 | Interest rate swap        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 21) 53,517   54,970  
Fair value | Level 2 | Commodity contract        
Derivatives:        
MTM asset on TTF linked commodity swap derivatives (note 21) $ 91,193   $ 113,368