Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Oil and gas producing properties, successful efforts method	$ 21,316,834	$ 21,814,779	$ 23,937,154
Less: Accumulated depreciation and depletion	5,402,515	4,666,212	5,121,646
Net capitalized costs	15,914,319	17,148,567	$ 18,815,508
Net property, plant and equipment	16,155,490	17,392,507
Other Properties
Property, Plant and Equipment [Line Items]
Net property, plant and equipment	$ 241,171	$ 243,940