Supplemental Oil and Gas Disclosures (Unaudited) - Schedule of Standardized Measure of Discounted Future Net Cash Flows Related to Interest in Proved Oil, Natural Gas and NGL Reserves (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Extractive Industries [Abstract]
Future cash inflows	$ 4,927,497	$ 7,151,875	$ 8,654,631
Future costs:
Production	(1,105,211)	(1,633,432)	(1,740,850)
Development and abandonment	(1,236,874)	(1,464,270)	(1,349,005)
Future net cash flows before income taxes	2,585,412	4,054,173	5,564,776
Future income tax expense	(141,515)	(662,317)	(862,473)
Future net cash flows after income taxes	2,443,897	3,391,856	4,702,303
Discount at 10% annual rate	(538,963)	(854,261)	(1,362,057)
Standardized measure of discounted future net cash flows	$ 1,904,934	$ 2,537,595	$ 3,340,246	$ 1,807,669