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Debt (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Nov. 15, 2018
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Apr. 11, 2019
USD ($)
Debt        
Drawn from facility   $ 39,000    
Minimum        
Debt        
EBITDA to interest expense coverage ratio   2.50    
Maximum        
Debt        
Net indebtedness to EBITDA covenant   4.00    
RBL        
Debt        
Maximum borrowing capacity   $ 170,000 $ 170,000 $ 170,000
Repayment of debt   36,000    
Drawn from facility   59,100 23,100  
Current borrowing capacity   $ 109,000    
Weighted-average interest rate (as a percent)   7.00%    
Unamortized debt issuance costs   $ 1,000 $ 1,200  
Commitment fee (as a percent)   0.50    
Net indebtedness to EBITDA covenant 1.50      
Liquidity covenant $ 50,000      
RBL | Stock Buyback Equalization Program        
Debt        
Drawn from facility   $ 39,000    
RBL | LIBOR        
Debt        
Basis rate (as a percent)   4.50%    
Floor (as a percent)   1.00%    
Letter of Credit        
Debt        
Letter of credit obligations   $ 1,900