Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Oil and gas producing properties, successful efforts method	$ 21,814,779	$ 23,937,154	$ 13,878,659
Accumulated depreciation and depletion	(4,666,212)	(5,121,646)	(4,217,154)
Net capitalized costs	17,148,567	18,815,508	$ 9,661,505
Net property, plant and equipment	17,392,507	19,730,008
Other Properties
Property, Plant and Equipment [Line Items]
Net property, plant and equipment	$ 243,940	$ 914,500