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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Extractive Industries [Abstract]        
Future cash inflows $ 7,151,875 $ 8,654,631 $ 4,308,863  
Future costs:        
Production (1,633,432) (1,740,850) (815,509)  
Development and abandonment (1,464,270) (1,349,005) (823,164)  
Future net cash flows before income taxes 4,054,173 5,564,776 2,670,190  
Future income tax expense (662,317) (862,473) 0  
Future net cash flows after income taxes 3,391,856 4,702,303 2,670,190  
Discount at 10% annual rate (854,261) (1,362,057) (862,521)  
Standardized measure of discounted future net cash flows $ 2,537,595 $ 3,340,246 $ 1,807,669 $ 1,336,035