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Long-Term Debt - Narrative (Details)
shares in Millions
9 Months Ended
Mar. 31, 2017
USD ($)
Oct. 17, 2016
USD ($)
Sep. 27, 2016
USD ($)
payment
shares
Feb. 17, 2016
USD ($)
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Jul. 03, 2013
USD ($)
Aug. 19, 2010
USD ($)
Debt Instrument [Line Items]                  
Principal amount         $ 277,378,000   $ 280,295,000    
Amortization of financing costs         0 $ 10,073,000      
Senior Notes | 10% Senior Unsecured Notes due 2017                  
Debt Instrument [Line Items]                  
Principal amount         $ 0   $ 22,650,000 $ 200,000,000 $ 150,000,000
Stated interest rate         10.00%   10.00% 10.00% 10.00%
Long-term debt       $ 135,600,000 $ 0   $ 22,568,000    
Excess (shortfall) carrying value         0   0    
Deferred finance costs, net         0   (82,000)    
Senior Notes | 10% Senior Secured Notes due 2021                  
Debt Instrument [Line Items]                  
Principal amount         $ 14,177,000   $ 14,177,000    
Stated interest rate         10.00%   10.00%    
Long-term debt         $ 14,932,000   $ 15,228,000    
Excess (shortfall) carrying value         975,000   1,159,000    
Deferred finance costs, net         (220,000)   (108,000)    
Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021                  
Debt Instrument [Line Items]                  
Principal amount         $ 263,201,000   $ 243,468,000    
Stated interest rate         10.00%   10.00%    
Long-term debt         $ 265,631,000   $ 248,600,000    
Excess (shortfall) carrying value         (531,000)   (590,000)    
Deferred finance costs, net         $ 0   0    
Private Exchange Offer and Consent Solicitation                  
Debt Instrument [Line Items]                  
Repayments of debt       53,600,000          
Private Exchange Offer and Consent Solicitation | Senior Notes | 10% Senior Unsecured Notes due 2017                  
Debt Instrument [Line Items]                  
Debt conversion, original debt, amount       $ 214,400,000          
Debt conversion, original debt, percent of total       61.00%          
Gain on extinguishment of debt       $ 0          
Private Exchange Offer and Consent Solicitation | Senior Notes | 10% Senior Secured Notes due 2021                  
Debt Instrument [Line Items]                  
Stated interest rate       10.00% 10.00%        
Debt conversion, amount       $ 144,700,000          
Excess (shortfall) carrying value       $ 13,900,000          
Amortization of financing costs         $ 200,000        
Private Exchange Offer and Consent Solicitation | Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021                  
Debt Instrument [Line Items]                  
Stated interest rate         10.00%        
Excess (shortfall) carrying value     $ (600,000)   $ (500,000)        
Amortization of financing costs         100,000        
September Exchange and Consent Solicitation | Senior Notes | 10% Senior Unsecured Notes due 2017                  
Debt Instrument [Line Items]                  
Debt conversion, original debt, amount     $ 113,000,000            
Debt conversion, original debt, percent of total     83.00%            
Long-term debt     $ 22,700,000            
Redemption price, percentage 100.00%                
Repayments of debt $ 22,800,000                
Gain on extinguishment of debt     0            
September Exchange and Consent Solicitation | Senior Notes | 10% Senior Secured Notes due 2021                  
Debt Instrument [Line Items]                  
Debt conversion, original debt, amount     $ 130,500,000            
Debt conversion, original debt, percent of total     90.00%            
Long-term debt     $ 14,200,000            
September Exchange and Consent Solicitation | Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021                  
Debt Instrument [Line Items]                  
Debt conversion, amount     $ 243,500,000            
Number of interest payments with variable rate | payment     3            
Common Stock | Private Exchange Offer and Consent Solicitation                  
Debt Instrument [Line Items]                  
Debt conversion, shares issued | shares     3.5 1.1          
PIK Interest | September Exchange and Consent Solicitation | Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021                  
Debt Instrument [Line Items]                  
Stated interest rate     1.00%            
Basis spread on variable rate     9.00%            
Term Loan | Line of Credit                  
Debt Instrument [Line Items]                  
Principal amount         30,000,000   10,000,000    
Long-term debt         27,788,000   7,249,000    
Excess (shortfall) carrying value         0   0    
Deferred finance costs, net         (2,212,000)   $ (2,751,000)    
Term Loan | Line of Credit | Loan Agreement                  
Debt Instrument [Line Items]                  
Stated interest rate   10.00%              
Long-term debt         $ 30,000,000        
First priority lien as percent of total value of oil and gas properties   90.00%              
Borrowing availability period   3 years              
Maximum borrowing capacity   $ 50,000,000              
Covenant compliance, present value of estimated future net revenues, discount percent   10.00%              
Covenant compliance, ratio of present value of estimated future net revenues to sum of outstanding term loans and commitments         2