Quarterly report pursuant to Section 13 or 15(d)

REVOLVING LINE OF CREDIT (Details)

v3.21.2
REVOLVING LINE OF CREDIT (Details) - USD ($)
9 Months Ended
Sep. 30, 2021
Jun. 10, 2021
Dec. 31, 2020
Apr. 30, 2019
Line of Credit Facility [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity       $ 1,000,000,000
Line of Credit Facility, Current Borrowing Capacity   $ 350,000,000    
Debt Instrument, Basis Spread on Variable Rate 0.00%      
Long-term Line of Credit $ 295,000,000   $ 313,000,000  
Minimum        
Line of Credit Facility [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 1.50%      
Leverage Ratio, Total 1.0      
Current Ratio 1.0      
Minimum | 2022        
Line of Credit Facility [Line Items]        
Number of barrels per day   3,100    
Maximum        
Line of Credit Facility [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 2.50%      
Leverage Ratio, Total 4.0      
Current Ratio 1.0      
Maximum | 2022        
Line of Credit Facility [Line Items]        
Number of barrels per day   4,000    
Federal Funds Purchased        
Line of Credit Facility [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 0.50%      
London Interbank Offered Rate (LIBOR)        
Line of Credit Facility [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 1.00%      
London Interbank Offered Rate (LIBOR) | Minimum        
Line of Credit Facility [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 2.50%      
London Interbank Offered Rate (LIBOR) | Maximum        
Line of Credit Facility [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 3.50%