Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Oil and gas producing properties, successful efforts method	$ 21,771,025	$ 21,316,834	$ 21,814,779
Less: Accumulated depreciation and depletion	5,866,418	5,402,515	4,666,212
Net oil and gas producing properties	15,904,607	15,914,319	$ 17,148,567
Other properties, at cost less accumulated depreciation	149,658	241,171
Net property, plant and equipment	$ 16,054,265	$ 16,155,490