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Supplemental Oil and Gas Disclosures (Unaudited) - Schedule of Principal Changes in Standardized Measure of Discounted Future Net Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Extractive Industries [Abstract]
Standardized measure, beginning of year	$ 2,537,595	$ 3,340,246	$ 1,807,669
Sales and transfers of oil, net gas and NGLs produced during the period	(339,557)	(665,226)	(727,969)
Net change in prices and production costs	(1,468,304)	(849,696)	1,578,330
Changes in estimated future development costs	32,589	(75,564)	32,328
Previously estimated development costs incurred	46,143	117,049	45,937
Accretion of discount	299,302	392,526	180,767
Net change in income taxes	361,875	129,590	(585,017)
Purchases of reserves	730,611	75,009	943,519
Extensions and discoveries	71,589	306,515	148,068
Net change due to revision in quantity estimates	(309,338)	(199,576)	190,853
Changes in production rates (timing) and other	(57,571)	(33,278)	(274,239)
Standardized measure, end of year	$ 1,904,934	$ 2,537,595	$ 3,340,246

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