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Debt - Additional Information (Details) - Credit Facility - Revolving Credit Facility
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Debt Instrument    
Maximum borrowing capacity $ 75,000,000.0 $ 75,000,000.0
Debt outstanding 12,000,000.0 12,000,000.0
Outstanding letters of credit 4,300,000 4,300,000
Borrowing base $ 58,700,000 $ 58,700,000
Commitment fee   0.50%
Average interest rate during period 2.90% 3.20%
Percentage of proved reserves pledged as collateral 85.00% 85.00%
Total net leverage ratio (no greater than) 3.50 3.50
Interest coverage ratio (no less than) 2.25 2.25
Leverage ratio (0.01) (0.01)
Coverage ratio 27.13 27.13
Minimum | LIBOR    
Debt Instrument    
Basis spread on variable rate   2.00%
Minimum | Base Rate    
Debt Instrument    
Basis spread on variable rate   1.00%
Maximum | LIBOR    
Debt Instrument    
Basis spread on variable rate   3.00%
Maximum | Base Rate    
Debt Instrument    
Basis spread on variable rate   2.00%