Annual report pursuant to Section 13 and 15(d)

LONG TERM DEBT - Schedule of Long Term Debt (Details)

v3.20.4
LONG TERM DEBT - Schedule of Long Term Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Oct. 21, 2019
Line of Credit Facility [Line Items]        
Principal $ 949,755 $ 1,127,733    
Unamortized debt discounts and premiums 2,041 4,860    
Unamortized debt issuance costs (6,953) (14,432)    
Total debt 944,843 1,118,161    
Less current portion of long-term debt (65,000) 0    
Total long-term debt 879,843 1,118,161    
Write-off of debt issuance costs 1,543 0 $ 0  
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Principal 532,000 580,000    
Write-off of debt issuance costs 1,500 0    
Revolving Credit Facility | Other Noncurrent Assets        
Line of Credit Facility [Line Items]        
Unamortized debt issuance costs (6,500) (9,800)    
8.5% Second Lien Notes due 2023        
Line of Credit Facility [Line Items]        
Principal 287,755 417,733    
Total debt       $ 200,000
Unsecured Ven Bakken Note        
Line of Credit Facility [Line Items]        
Principal $ 130,000 $ 130,000