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Long-Term Debt - Narrative (Details)
shares in Millions
12 Months Ended
Dec. 28, 2017
USD ($)
shares
Mar. 31, 2017
USD ($)
Oct. 17, 2016
USD ($)
Sep. 27, 2016
USD ($)
payment
shares
Feb. 17, 2016
USD ($)
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2017
Jun. 30, 2017
Jan. 14, 2016
Jul. 03, 2013
USD ($)
Aug. 19, 2010
USD ($)
Debt Instrument [Line Items]                          
Principal amount           $ 272,629,000 $ 280,295,000            
Gain (loss) on extinguishment of debt           403,000 0 $ 0          
Amortization of debt issuance costs           0 (10,139,000) $ 0          
10% Senior Unsecured Notes Due 2017                          
Debt Instrument [Line Items]                          
Repayments of debt   $ 22,800,000                      
10% Senior Unsecured Notes Due 2017 | Senior Notes                          
Debt Instrument [Line Items]                          
Principal amount           $ 0 $ 22,650,000         $ 200,000,000 $ 150,000,000
Stated interest rate (as a percent)           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           0 (82,000)            
10% Senior Secured Notes due 2021                          
Debt Instrument [Line Items]                          
Debt extinguished $ 4,800,000                        
Common shares issued related to extinguishment of debt | shares 2.2                        
10% Senior Secured Notes due 2021 | Senior Notes                          
Debt Instrument [Line Items]                          
Principal amount           $ 9,427,000 14,177,000            
Stated interest rate (as a percent)           10.00%              
Long-term debt           $ 9,821,000 15,228,000            
Excess (shortfall) carrying value           606,000 1,159,000            
Deferred finance costs           (212,000) (108,000)            
10% Senior Secured PIK Notes due 2021 | Payment in Kind (PIK) Note                          
Debt Instrument [Line Items]                          
Principal amount           $ 263,202,000 243,468,000            
Stated interest rate (as a percent)           10.00%              
Long-term debt           $ 271,577,000 248,600,000            
Excess (shortfall) carrying value           (508,000) (590,000)            
Deferred finance costs           0 0            
Private Exchange Offer and Consent Solicitation                          
Debt Instrument [Line Items]                          
Repayments of debt         53,600,000                
Private Exchange Offer and Consent Solicitation | 10% Senior Unsecured Notes Due 2017 | Senior Notes                          
Debt Instrument [Line Items]                          
Debt conversion, original debt, amount         $ 214,400,000                
Debt conversion, original debt, percent of total         61.00%                
Gain (loss) on extinguishment of debt         $ 0                
Private Exchange Offer and Consent Solicitation | 10% Senior Secured Notes due 2021 | Senior Notes                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent)                     10.00%    
Debt conversion, converted instrument, amount         144,700,000                
Long-term debt         $ 13,900,000                
Amortization of debt issuance costs           (600,000)              
Private Exchange Offer and Consent Solicitation | 10% Senior Secured PIK Notes due 2021 | Payment in Kind (PIK) Note                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent)                 10.00%        
Excess (shortfall) carrying value       $ (600,000)   500,000              
Amortization of debt issuance costs           (100,000)              
September Exchange And Consent Solicitation | 10% Senior Unsecured Notes Due 2017 | Senior Notes                          
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                  
September Exchange And Consent Solicitation | 10% Senior Secured Notes due 2021 | Senior Notes                          
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 | 10% Senior Secured PIK Notes due 2021 | Payment in Kind (PIK) Note                          
Debt Instrument [Line Items]                          
Debt conversion, converted instrument, amount       $ 243,500,000                  
Number of interest payments with variable rate | payment       3                  
September Exchange And Consent Solicitation | 10% Senior Secured PIK Notes due 2021 | PIK Interest | Payment in Kind (PIK) Note                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent)       1.00%                  
Adjusted LIBO rate (as a percent)       9.00%                  
Common Stock | Private Exchange Offer and Consent Solicitation                          
Debt Instrument [Line Items]                          
Debt conversion, converted instrument, shares issued | shares       3.5 1.1                
Term Loan | Line of Credit                          
Debt Instrument [Line Items]                          
Principal amount           30,000,000 10,000,000            
Long-term debt           27,963,000 7,249,000            
Excess (shortfall) carrying value           0 0            
Deferred finance costs           (2,037,000) $ (2,751,000)            
Term Loan | Loan Agreement | Line of Credit                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent)     10.00%                    
Long-term debt           $ 30,000,000              
Revolving credit facility     $ 50,000,000                    
Borrowing availability period     3 years                    
First priority lien as percent of total value of oil and gas properties     90.00%                    
Present value of estimated future net revenues, discount percent     10.00%                    
Ratio of present value of estimated future net revenues to sum of outstanding term loans and commitments                   2