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Segment Information - Reconciliation (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Segment Reporting Information [Line Items]    
Net income/(loss) $ 101,725 $ (85,659)
Income taxes 278 1,697
Income/(loss) before income taxes 102,003 (83,962)
Depreciation and amortization 26,256 25,027
Impairment of long-lived assets 0 5,021
Unrealized loss on oil and gas derivative instruments (note 7) (56,635) 87,754
Realized and unrealized mark-to-market losses on investment in listed equity securities (note 8) 0 62,308
Other non-operating income, net 0 (9,823)
Interest income (18,582) (23,318)
Interest expense 0 972
Gains on derivative instruments, net (6,309) (2,297)
Other financial items, net 2,694 1,375
Net losses from equity method investments (note 15) 2,339 296
Net income from discontinued operations 0 (293)
Adjusted EBITDA 122,303 166,963
Oil and gas derivative    
Segment Reporting Information [Line Items]    
Unrealized loss on oil and gas derivative instruments (note 7) $ 13,902 $ 191,657