Oil and Gas Properties - Schedule of Oil and Gas Properties (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Proven properties:
Acquisition, equipment, exploration, drilling and abandonment costs	$ 11,820,726	$ 11,820,392
Less: Accumulated depletion, depreciation, amortization, and impairment	(10,553,983)	(10,267,973)
Total Oil and gas properties, net	$ 1,266,743	$ 1,552,419