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
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Nov. 30, 2019
Debt Instrument [Line Items]            
Principal Balance $ 988,755   $ 988,755   $ 1,127,733  
Unamortized debt discounts and premiums 2,276   2,276   4,860  
Unamortized debt issuance costs (7,704)   (7,704)   (14,432)  
Total debt 983,327   983,327   1,118,161  
Less current portion of long-term debt (65,000)   (65,000)   0  
Total long-term debt 918,327   918,327   1,118,161  
Write-off of debt issuance costs 1,543 $ 0 1,543 $ 0    
Second Lien Notes due 2023 | Line of Credit            
Debt Instrument [Line Items]            
Principal Balance 287,755   287,755   417,733  
Unsecured VEN Bakken Note            
Debt Instrument [Line Items]            
Principal Balance 130,000   130,000   130,000  
Revolving Credit Facility            
Debt Instrument [Line Items]            
Principal Balance 571,000   571,000   580,000  
Revolving Credit Facility | Other Noncurrent Assets, Net            
Debt Instrument [Line Items]            
Unamortized debt issuance costs $ (6,900)   $ (6,900)   $ (9,800)  
Revolving Credit Facility | Second Lien Notes due 2023            
Debt Instrument [Line Items]            
Total debt           $ 200,000