Properties and Equipment, Net - Schedule of Aging of Capitalized Exploratory Well Costs (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Capitalized exploratory well costs that have been capitalized for a period of one year or less	$ 0	$ 0	$ 0
Capitalized exploratory well costs that have been capitalized for a period greater than one year	0	0	0
Capitalized exploratory well costs	$ 0	$ 0	$ 0	$ 19,511