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Derivative Financial Instruments - Schedule of derivative instruments by location of gain/(loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative instruments, Location of Gain/(Loss)        
Amount of Gain/(Loss) $ (36,130) $ 540 $ (259,289) $ 32,156
Provisional oil sales | Oil and gas revenue        
Derivative instruments, Location of Gain/(Loss)        
Amount of Gain/(Loss) 2,094 1,727 (6,683) (2,620)
Commodity | Derivatives, net        
Derivative instruments, Location of Gain/(Loss)        
Amount of Gain/(Loss) $ (38,224) $ (1,187) $ (252,606) $ 34,776