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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ 224,288 $ 216,338
Realized gain on derivatives 10,867 3,270
Unrealized gain (loss) on derivatives 136,430 (45,719)
Total revenue 371,585 173,889
Oil revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 169,585 154,204
Natural gas revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 28,329 39,065
Third-party midstream services revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 15,830 11,838
Sales of purchased natural gas    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 10,544 11,231
Total revenues from contracts with customers    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ 224,288 $ 216,338