Property, Plant and Equipment - Net Changes in Capitalized Exploratory Well Costs (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Movement in Property, Plant and Equipment [Roll Forward]
Beginning balance	$ 171,860	$ 179,481
Additions pending the determination of proved reserves	40,825	22,275
Reclassifications to proved properties based on the determination of proved reserves	(1,065)	0
Capitalized exploratory well costs charged to expense	(26,143)	(20,295)
Ending balance	$ 185,477	$ 181,461