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Debt - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 21, 2019
Jun. 20, 2019
Feb. 28, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Debt Instrument              
Repayments of borrowings           $ 60,596,000 $ 36,304,000
Gain on extinguishment of debt       $ 0 $ 0 0 1,151,000
Credit Facility | Revolving Credit Facility              
Debt Instrument              
Maximum borrowing capacity $ 600,000,000.0 $ 350,000,000.0          
Borrowing base $ 300,000,000.0            
Lender party commitments       $ 270,000,000.0   $ 270,000,000.0  
Commitment fee           0.50%  
Percentage of proved reserves pledged as collateral   95.00%   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       0.25   0.25  
Coverage ratio       63.13   63.13  
Debt outstanding       $ 52,000,000.0   $ 52,000,000.0  
Outstanding letters of credit       $ 7,600,000   $ 7,600,000  
Credit Facility | Revolving Credit Facility | Minimum | LIBOR              
Debt Instrument              
Basis spread on variable rate 2.00% 3.00%          
Credit Facility | Revolving Credit Facility | Minimum | Base Rate              
Debt Instrument              
Basis spread on variable rate 1.00% 2.00%          
Credit Facility | Revolving Credit Facility | Maximum | LIBOR              
Debt Instrument              
Basis spread on variable rate 3.00% 4.00%          
Credit Facility | Revolving Credit Facility | Maximum | Base Rate              
Debt Instrument              
Basis spread on variable rate 2.00% 3.00%          
New Building Note | Secured Notes              
Debt Instrument              
Repayments of borrowings     $ 36,300,000        
Face amount of debt instrument     35,000,000.0        
Interest costs paid-in-kind     $ 1,300,000        
Gain on extinguishment of debt             $ 1,200,000