Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
geographic_area
revenue_source
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
geographic_area
revenue_source
Jun. 30, 2018
USD ($)
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 $ 139.8 $ 101.0 $ 263.4 $ 180.2
Natural Gas and NGL        
Accounting Policies [Line Items]        
Sales $ 10.0 $ 8.0 $ 19.1 $ 15.7