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Long-Term Debt - Narrative (Details)
9 Months Ended
Oct. 17, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Feb. 17, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jul. 03, 2013
USD ($)
Aug. 19, 2010
USD ($)
Debt Instrument [Line Items]                  
Principal amount   $ 280,295,000         $ 350,000,000    
Credit Agreement                  
Debt Instrument [Line Items]                  
Period used in determining EBITDAX to cash interest expense   12 months              
10% Senior Unsecured Notes due 2017 | Senior Notes                  
Debt Instrument [Line Items]                  
Principal amount   $ 22,650,000         $ 350,000,000 $ 200,000,000 $ 150,000,000
Interest rate of Senior Notes   10.00%         10.00% 10.00% 10.00%
Deferred finance costs, net   $ (112,000)         $ (2,992,000)    
Long-term debt   22,538,000       $ 135,600,000      
10% Senior Secured Notes due 2021 | Senior Notes                  
Debt Instrument [Line Items]                  
Principal amount   $ 14,177,000         0    
Interest rate of Senior Notes   10.00%              
Deferred finance costs, net   $ (109,000)         0    
Long-term debt   15,286,000         0    
Scenario, Forecast | Credit Agreement | Minimum                  
Debt Instrument [Line Items]                  
Current ratio         1.0        
Long-term Debt | Accounting Standards Update 2015-03 | 10% Senior Unsecured Notes due 2017 | Senior Notes                  
Debt Instrument [Line Items]                  
Deferred finance costs, net   (100,000)         $ (3,000,000)    
Long-term Debt | Accounting Standards Update 2015-03 | 10% Senior Secured Notes due 2021 | Senior Notes                  
Debt Instrument [Line Items]                  
Deferred finance costs, net   $ (109,000)              
Term Loan | Scenario, Forecast | Loan Agreement | Line of Credit                  
Debt Instrument [Line Items]                  
Covenant compliance, ratio of present value of estimated future net revenues to sum of outstanding term loans and commitments     2 1.7 1.7        
Term Loan | Subsequent Event | Loan Agreement | Line of Credit                  
Debt Instrument [Line Items]                  
Borrowing availability period 3 years                
Maximum borrowing capacity $ 50,000,000                
Interest rate of Senior Notes 10.00%                
Long-term debt $ 10,000,000                
First priority lien as percent of total value of oil and gas properties 90.00%                
Covenant compliance, present value of estimated future net revenues, discount percent 10.00%