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Revenue Recognition - Disaggregation of Revenues (Details) - USD ($)
$ in Thousands
 1 Months Ended 11 Months Ended 12 Months Ended
Dec. 31, 2020
Nov. 19, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]        
Revenues $ 119,915 $ 963,419 $ 2,071,744 $ 2,321,947
E&P        
Disaggregation of Revenue [Line Items]        
Revenues 93,794   1,859,506 2,197,810
Midstream        
Disaggregation of Revenue [Line Items]        
Revenues 43,257 376,815 488,427 286,642
Operating segments | E&P        
Disaggregation of Revenue [Line Items]        
Revenues 93,794 775,888 1,859,506 2,197,810
Operating segments | E&P | Crude oil revenues        
Disaggregation of Revenue [Line Items]        
Revenues 69,075 522,812 1,261,413 1,425,409
Operating segments | E&P | Purchased crude oil sales        
Disaggregation of Revenue [Line Items]        
Revenues 6,771 160,420 401,554 540,633
Operating segments | E&P | Natural gas and NGL revenues        
Disaggregation of Revenue [Line Items]        
Revenues 17,367 80,773 147,358 164,615
Operating segments | E&P | Purchased natural gas sales        
Disaggregation of Revenue [Line Items]        
Revenues 366 5,047 7,207 6,078
Operating segments | E&P | Other services revenues        
Disaggregation of Revenue [Line Items]        
Revenues 215 6,836 41,974 61,075
Operating segments | Midstream        
Disaggregation of Revenue [Line Items]        
Revenues 26,121 187,531 212,238 124,137
Operating segments | Midstream | Purchased crude oil sales        
Disaggregation of Revenue [Line Items]        
Revenues 90 20,900 30 3,633
Operating segments | Midstream | Crude oil, natural gas and NGL revenues        
Disaggregation of Revenue [Line Items]        
Revenues 8,912 82,466 95,399 73,028
Operating segments | Midstream | Produced and flowback water revenues        
Disaggregation of Revenue [Line Items]        
Revenues 3,512 31,932 40,534 37,791
Operating segments | Midstream | Total midstream service revenues        
Disaggregation of Revenue [Line Items]        
Revenues 12,424 114,398 135,933 110,819
Operating segments | Midstream | Crude oil, natural gas and NGL revenues        
Disaggregation of Revenue [Line Items]        
Revenues 13,150 48,883 70,746 1,464
Operating segments | Midstream | Freshwater revenues        
Disaggregation of Revenue [Line Items]        
Revenues 457 3,350 5,529 8,221
Operating segments | Midstream | Total midstream product revenues        
Disaggregation of Revenue [Line Items]        
Revenues $ 13,697 $ 73,133 $ 76,305 $ 13,318