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Commodity Price Risk Management (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
bbl
$ / Barrel
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
bbl
$ / Barrel
Jun. 30, 2014
USD ($)
Derivative Liability, Fair Value, Net [Abstract]        
Realized derivative (loss) $ (25) $ (374) $ (139) $ (532)
Unrealized derivative (loss) (272) (238) (335) (411)
Total realized and unrealized derivative (loss) $ (297) $ (612) $ (474) $ (943)
Crude Oil Costless Collar 05/01/15 - 12/31/15 [Member]        
Derivative [Line Items]        
Counterparty     Wells Fargo  
Basis     WTI  
Quantity (barrels per day) | bbl 500   500  
Crude Oil Costless Collar 05/01/15 - 12/31/15 [Member] | Put Option [Member]        
Derivative [Line Items]        
Strike Price (in dollars per barrel) | $ / Barrel 45.00   45.00  
Crude Oil Costless Collar 05/01/15 - 12/31/15 [Member] | Call Option [Member]        
Derivative [Line Items]        
Strike Price (in dollars per barrel) | $ / Barrel 58.79   58.79  
Crude Oil Costless Collar 01/01/16 - 06/30/16 [Member]        
Derivative [Line Items]        
Counterparty     Wells Fargo  
Basis     WTI  
Quantity (barrels per day) | bbl 350   350  
Crude Oil Costless Collar 01/01/16 - 06/30/16 [Member] | Put Option [Member]        
Derivative [Line Items]        
Strike Price (in dollars per barrel) | $ / Barrel 57.50   57.50  
Crude Oil Costless Collar 01/01/16 - 06/30/16 [Member] | Call Option [Member]        
Derivative [Line Items]        
Strike Price (in dollars per barrel) | $ / Barrel 66.80   66.80  
Current Assets [Member] | Crude Oil Derivative Contract [Member]        
Derivative Asset, Fair Value, Net [Abstract]        
Derivative Assets, Gross amounts of recognized assets and liabilities $ 352   $ 352  
Derivative Asset, Gross amount offset in the Balance Sheet (352)   (352)  
Derivative Asset, Net amount of assets and liabilities in the Balance sheets 0   0  
Current Liabilities [Member] | Crude Oil Derivative Contract [Member]        
Derivative Liability, Fair Value, Net [Abstract]        
Derivative Assets, Gross amounts of recognized assets and liabilities 687   687  
Derivative Asset, Gross amount offset in the Balance Sheet (352)   (352)  
Derivative Asset, Net amount of assets and liabilities in the Balance sheets $ 335   $ 335