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Revenue Recognition - Disaggregated Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Total revenues $ 393,060 $ 166,352 $ 748,519 $ 554,150
E&P        
Disaggregation of Revenue [Line Items]        
Total revenues 328,987 121,826 611,685 453,213
E&P | Crude oil revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 206,729 81,059 392,547 293,852
E&P | Purchased crude oil sales        
Disaggregation of Revenue [Line Items]        
Total revenues 73,505 23,519 110,222 109,276
E&P | Natural gas and NGL revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 48,498 12,771 108,141 39,106
E&P | Purchased natural gas sales        
Disaggregation of Revenue [Line Items]        
Total revenues 60 4,081 354 4,602
E&P | Other services revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 195 396 421 6,377
Midstream Total        
Disaggregation of Revenue [Line Items]        
Total revenues 64,073 44,526 136,834 100,937
Midstream Total | Purchased crude oil sales        
Disaggregation of Revenue [Line Items]        
Total revenues 8,290 9,752 19,739 9,752
Midstream Total | Crude oil, natural gas and NGL revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 20,794 22,898 43,019 49,584
Midstream Total | Produced and flowback water revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 7,466 7,247 14,874 18,499
Midstream Total | Total midstream service revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 28,260 30,145 57,893 68,083
Midstream Total | Crude oil, natural gas and NGL revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 26,782 4,335 57,965 20,608
Midstream Total | Freshwater revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 741 294 1,237 2,494
Midstream Total | Total midstream product revenues        
Disaggregation of Revenue [Line Items]        
Total revenues $ 35,813 $ 14,381 $ 78,941 $ 32,854