Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Disaggregation of Revenue (Details)

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Disaggregation of 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]        
Revenues $ 225,717 $ 20,664 $ 383,048 $ 150,860
Oil Revenues        
Disaggregation of Revenue [Line Items]        
Revenues 184,617 28,784 319,916 145,116
Natural Gas and NGL Revenues        
Disaggregation of Revenue [Line Items]        
Revenues 41,100 (8,120) 63,132 5,744
Williston        
Disaggregation of Revenue [Line Items]        
Revenues   20,664 367,136 150,860
Williston | Oil Revenues        
Disaggregation of Revenue [Line Items]        
Revenues   28,784 315,373 145,116
Williston | Natural Gas and NGL Revenues        
Disaggregation of Revenue [Line Items]        
Revenues 29,855 (8,120) 51,763 5,744
Permian        
Disaggregation of Revenue [Line Items]        
Revenues 2,955 0 4,877 0
Permian | Oil Revenues        
Disaggregation of Revenue [Line Items]        
Revenues 2,745 0 4,543 0
Permian | Natural Gas and NGL Revenues        
Disaggregation of Revenue [Line Items]        
Revenues 210 0 334 0
Appalachian        
Disaggregation of Revenue [Line Items]        
Revenues 11,035 0 11,035 0
Appalachian | Oil Revenues        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Appalachian | Natural Gas and NGL Revenues        
Disaggregation of Revenue [Line Items]        
Revenues $ 11,035 $ 0 $ 11,035 $ 0