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Debt - Exit Facility (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Apr. 19, 2018
USD ($)
Debt      
Repayment of revolving credit facility $ 50,000    
RBL      
Debt      
Maximum borrowing capacity 170,000 $ 170,000 $ 170,000
Repayment of revolving credit facility 50,000    
Proceeds from revolving credit facility 78,100 128,100  
Availability under the facility $ 90,000    
Weighted-average interest rate (as a percent) 6.90%    
Unamortized debt issuance costs $ 1,100 1,200  
Commitment fee (as a percent) 0.50    
LIBOR Loans | RBL      
Debt      
Interest rate added to base rate (as a percent) 4.50%    
LIBOR floor rate 1.00%    
Minimum      
Debt      
EBITDA to interest expense coverage ratio 2.50    
Maximum      
Debt      
Total net indebtedness to EBITDA 4.00    
Senior Revolving Credit Facility, due 2018 | RBL      
Debt      
Outstanding letters of credit amount $ 1,900 $ 1,900