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Going Concern (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 27, 2016
Jun. 30, 2018
USD ($)
payment
Jun. 30, 2018
USD ($)
payment
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Class of Stock [Line Items]            
Decline in production, percent   (35.00%)        
Net cash (used in) provided by operating activities     $ (2,919) $ 13,694    
Cash and cash equivalents   $ 5,792 5,792 $ 19,772 $ 15,655 $ 28,312
Long-term debt   317,000 317,000      
Preferred stock dividend payable   $ 12,848 $ 12,848   10,278  
Series B Preferred Stock            
Class of Stock [Line Items]            
Number of deferred dividend payments | payment   9 9      
Other long-term liabilities | Series B Preferred Stock            
Class of Stock [Line Items]            
Preferred stock dividend payable   $ 12,800 $ 12,800      
Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021            
Class of Stock [Line Items]            
Long-term debt   $ 274,591 $ 274,591   $ 271,577  
Stated interest rate   10.00% 10.00%   10.00%  
PIK Interest | Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021            
Class of Stock [Line Items]            
Stated interest rate   10.00% 10.00%      
Cash interest payment due   $ 14,200 $ 14,200      
September Exchange and Consent Solicitation | PIK Interest | Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021            
Class of Stock [Line Items]            
Stated interest rate 1.00%          
Basis spread on variable rate 9.00%