Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)

v3.20.2
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
geographic_area
revenue_source
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
geographic_area
revenue_source
Jun. 30, 2019
USD ($)
Accounting Policies [Line Items]        
Number of revenue sources | revenue_source 2   2  
Number of geographic areas in which entity operates | geographic_area 1   1  
Oil        
Accounting Policies [Line Items]        
Sales $ 28,800 $ 139,800 $ 145,100 $ 263,400
Natural Gas and NGL        
Accounting Policies [Line Items]        
Sales (8,100) 10,000 5,700 19,100
Oil and Gas Sales        
Accounting Policies [Line Items]        
Sales $ 20,664 $ 149,847 $ 150,860 $ 282,530
Oil and Gas Sales | Sales | Operator Concentration Risk | Top Four Operators        
Accounting Policies [Line Items]        
Concentration risk percentage 57.00% 55.00% 51.00% 57.00%