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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 234,382 $ 212,426 $ 450,720 $ 397,448
Realized gain (loss) on derivatives 1,165 (2,488) 4,435 (6,746)
Unrealized gain (loss) on derivatives 6,157 1,429 (39,562) 11,845
Total revenue 241,704 211,367 415,593 402,547
Oil revenues        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 189,085 166,271 343,288 314,430
Natural gas revenues        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 21,975 42,748 61,041 76,543
Third-party midstream services revenues        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 14,359 3,407 26,197 6,475
Sales of purchased natural gas        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 8,963 0 20,194 0
Total revenues from contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 234,382 $ 212,426 $ 450,720 $ 397,448