Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT - Schedule of Debt (Details)

v3.20.2
LONG-TERM DEBT - Schedule of Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Oct. 21, 2019
Debt Instrument [Line Items]      
Principal Balance $ 995,287 $ 1,127,733  
Unamortized debt discounts and premiums 2,615 4,860  
Unamortized debt issuance costs (8,731) (14,432)  
Total debt 989,171 1,118,161  
Less current portion of long-term debt (65,000) 0  
Total long-term debt 924,171 1,118,161  
Second Lien Notes due 2023 | Line of Credit      
Debt Instrument [Line Items]      
Principal Balance 297,287 417,733  
Unsecured VEN Bakken Note      
Debt Instrument [Line Items]      
Principal Balance 130,000 130,000  
Revolving Credit Facility      
Debt Instrument [Line Items]      
Principal Balance 568,000 580,000  
Revolving Credit Facility | Other Noncurrent Assets, Net      
Debt Instrument [Line Items]      
Unamortized debt issuance costs $ (8,800) $ (9,800)  
Revolving Credit Facility | Second Lien Notes due 2023      
Debt Instrument [Line Items]      
Total debt     $ 200,000