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FINANCIAL INSTRUMENTS - Fair Value Hierarchy (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Non-Derivatives:        
Cash and cash equivalents $ 878,838 $ 231,849 $ 85,996 $ 179,699
Trade accounts receivable, carrying value 41,545 28,912    
Investment in listed equity securities, fair value 224,788 450,225    
Collateral amount 1,115,500 1,242,343    
Current portion of long-term debt and short-term debt, carrying value (344,778) (703,170)    
Long-term debt, carrying value (844,546) (920,130)    
Derivatives:        
Deferred finance charges 20,955 28,207    
Interest rate swap        
Non-Derivatives:        
Interest receivable 1,923 0    
Commodity contract        
Non-Derivatives:        
Receivable from TTF linked commodity swap derivatives 4,638 0    
Derivatives:        
Mark-to-market derivative valuation 113,368 1,665    
Derivative liability 0 0    
Commodity contract | Carrying value        
Derivatives:        
Mark-to-market derivative valuation 73,583 1,753    
Level 1 | Carrying value        
Non-Derivatives:        
Cash and cash equivalents 878,838 231,849    
Restricted cash and short-term deposits, carrying value 134,043 106,073    
Trade accounts receivable, carrying value 41,545 28,912    
Receivable from TTF linked commodity swap derivatives 4,638 0    
Interest receivable 1,923 0    
Investment in listed equity securities, carrying value 224,788 449,666    
Collateral amount 0 6,940    
Trade accounts payable, carrying value (8,983) (4,929)    
Derivatives:        
TTF linked commodity swap collateral 0 6,900    
Level 1 | Fair value        
Non-Derivatives:        
Cash and cash equivalents, fair value 878,838 231,849    
Restricted cash and short-term deposits, fair value 134,043 106,073    
Trade accounts receivable, fair value 41,545 28,912    
Other receivables, fair value disclosure 4,638 0    
Interest receivable, fair value 1,923 0    
Investment in listed equity securities, fair value 224,788 449,666    
Collateral amount, fair value 0 6,940    
Trade accounts payable, fair value (8,983) (4,929)    
Level 2 | Carrying value        
Non-Derivatives:        
Assets held for sale (note 14) 721 1,697,776    
Liabilities held for sale (note 14) (373) (879,904)    
Current portion of long-term debt and short-term debt, carrying value (344,960) (388,005)    
Current portion of convertible bonds, carrying value 0 (315,646)    
Long-term debt, carrying value (706,290) (947,855)    
Unsecured bonds, carrying value 159,029 0    
Level 2 | Fair value        
Non-Derivatives:        
Assets held-for-sale, fair value 721 1,697,776    
Liabilities Held For Sale, Fair Value (373) (879,904)    
Current portion of long-term debt and short-term debt, fair value (344,960) (388,005)    
Current portion of convertible bonds, fair value 0 (316,561)    
Long-term debt, fair value (706,290) (947,855)    
Unsecured bonds, fair value 158,092 0    
Level 2 | Oil and gas derivative | Carrying value        
Derivatives:        
Mark-to-market derivative valuation 378,979 207,058    
Level 2 | Oil and gas derivative | Fair value        
Derivatives:        
Mark-to-market derivative valuation 378,979 207,058    
Level 2 | Interest rate swap | Carrying value        
Derivatives:        
Mark-to-market derivative valuation 54,970 0    
Derivative liability 0 (17,300)    
Level 2 | Interest rate swap | Fair value        
Derivatives:        
Mark-to-market derivative valuation 54,970 0    
Derivative liability 0 (17,300)    
Level 2 | Commodity contract | Carrying value        
Derivatives:        
Mark-to-market derivative valuation 113,368 1,753    
Derivative liability 0 (88)    
Level 2 | Commodity contract | Fair value        
Derivatives:        
Mark-to-market derivative valuation 113,368 1,753    
Derivative liability $ 0 $ (88)