Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 336,181	$ 224,288
Realized (loss) gain on derivatives	(25,913)	10,867
Unrealized (loss) gain on derivatives	(43,423)	136,430
Total revenue	266,845	371,585
Oil revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	213,279	169,585
Natural gas revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	102,954	28,329
Third-party midstream services revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	15,438	15,830
Sales of purchased natural gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	4,510	10,544
Total revenues from contracts with customers
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 336,181	$ 224,288