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Long-Term Debt - Narrative (Details)
shares in Millions
6 Months Ended
Mar. 31, 2017
USD ($)
Oct. 17, 2016
USD ($)
Sep. 27, 2016
USD ($)
payment
shares
Feb. 17, 2016
USD ($)
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Jan. 14, 2016
Jul. 03, 2013
USD ($)
Aug. 19, 2010
USD ($)
Debt Instrument [Line Items]                    
Principal amount         $ 266,045,000   $ 280,295,000      
Amortization of financing costs         0 $ 4,808,000        
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         $ 15,008,000   $ 15,228,000      
Excess (shortfall) carrying value         1,037,000   1,159,000      
Deferred finance costs, net         (206,000)   (108,000)      
Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021                    
Debt Instrument [Line Items]                    
Principal amount         $ 251,868,000   $ 243,468,000      
Stated interest rate         10.00%   10.00%      
Long-term debt         $ 259,816,000   $ 248,600,000      
Excess (shortfall) carrying value         (553,000)   (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         $ 100,000          
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)   $ (600,000)          
Amortization of financing costs         37,000          
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                  
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         27,605,000   7,249,000      
Excess (shortfall) carrying value         0   0      
Deferred finance costs, net         (2,395,000)   $ (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