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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, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ 216,338 $ 185,022
Realized gain (loss) on derivatives 3,270 (4,258)
Unrealized (loss) gain on derivatives (45,719) 10,416
Total revenue 173,889 191,180
Oil revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 154,204 148,159
Natural gas revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 39,065 33,795
Third-party midstream services revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 11,838 3,068
Sales of purchased natural gas    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 11,231 0
Total revenues from contracts with customers    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ 216,338 $ 185,022