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Supplemental Oil and Gas Reserve Information - Discounted Future Cash Flows Relating to Proved Reserves and Disclosures (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Oil and Gas Exploration and Production Industries [Line Items]  
Future cash inflows $ 5,197,220
Future production costs 2,792,921
Future development costs 610,658
Future outflows for income tax 232,849
Future net cash flows 1,560,792
10% annual discount for estimated timing of cash flows 611,915
Standardized measure of discounted future net cash flows 948,877
Pro Forma  
Oil and Gas Exploration and Production Industries [Line Items]  
Future cash inflows 6,249,050
Future production costs 3,738,979
Future development costs 590,227
Future outflows for income tax 179,121
Future net cash flows 1,740,723
10% annual discount for estimated timing of cash flows 600,711
Standardized measure of discounted future net cash flows 1,140,012
Permian Basin Sale  
Oil and Gas Exploration and Production Industries [Line Items]  
Future cash inflows (1,010,896)
Future production costs (404,546)
Future development costs (177,445)
Future outflows for income tax (64,673)
Future net cash flows (364,232)
10% annual discount for estimated timing of cash flows (203,962)
Standardized measure of discounted future net cash flows (160,270)
Williston Basin Acquisition  
Oil and Gas Exploration and Production Industries [Line Items]  
Future cash inflows 2,062,726
Future production costs 1,350,604
Future development costs 157,014
Future outflows for income tax 10,945
Future net cash flows 544,163
10% annual discount for estimated timing of cash flows (192,758)
Standardized measure of discounted future net cash flows $ 351,405