Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT - Schedule of Long-term Debt Instruments (Details)

v3.21.2
LONG-TERM DEBT - Schedule of Long-term Debt Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Principal balance $ 813,000 $ 949,755
Unamortized debt discounts and premiums 0 2,041
Unamortized debt issuance costs (11,002) (6,953)
Total debt 801,998 944,843
Less current portion of long-term debt 0 (65,000)
Total long-term debt 801,998 879,843
Unsecured Notes due 2028 | Unsecured Debt    
Debt Instrument [Line Items]    
Principal balance 550,000 0
Second Lien Notes due 2023 | Second Lien Notes    
Debt Instrument [Line Items]    
Principal balance 0 287,755
Unsecured VEN Bakken Note due 2022 | Unsecured Debt    
Debt Instrument [Line Items]    
Principal balance 0 130,000
Revolving Credit Facility    
Debt Instrument [Line Items]    
Principal balance 263,000 532,000
Revolving Credit Facility | Other Noncurrent Assets, Net    
Debt Instrument [Line Items]    
Unamortized debt issuance costs $ (6,200) $ (6,500)