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SEGMENT INFORMATION - Summary of Reconciliation of Net Income/(Loss) to Adjusted EBITDA (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Net income/(loss) $ 939,057 $ 560,615 $ (167,930)
Income taxes (438) 1,440 579
Income/(loss) before income taxes 938,619 562,055 (167,351)
Depreciation and amortization 51,712 55,362 55,940
Impairment of long-lived assets 76,155 0 0
Unrealized (gain)/loss on oil and gas derivative instruments (note 8) (520,997) (204,663) 42,561
Realized and unrealized mark-to-market (gains)/losses on our investment in listed equity securities (note 9) (400,966) 295,777 0
Other non-operating (income)/losses (note 9) (11,916) 66,027 (5,682)
Interest income (12,225) (128) (1,479)
Interest expense 19,286 34,486 39,182
(Gains)/losses on derivative instruments (note 10) (71,497) (24,348) 52,423
Other financial items, net (note 10) 5,380 (693) 557
Net (income)/loss from equity method investments (note 17) (19,041) (1,080) 537
Net loss/(income) from discontinued operations (note 14) 76,450 (625,389) 142,912
Adjusted EBITDA 362,980 182,178 162,139
Oil and gas derivative      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Unrealized (gain)/loss on oil and gas derivative instruments (note 8) (288,977) (179,891) 45,100
Continuing operations      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Income taxes 438 (1,440) (579)
Depreciation and amortization 51,712 55,362 55,940
Impairment of long-lived assets 76,155 0 0
Realized and unrealized mark-to-market (gains)/losses on our investment in listed equity securities (note 9) (400,966) 295,777 0
Net (income)/loss from equity method investments (note 17) $ (19,041) $ (1,080) $ 537