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Commodity Price Risk Management (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) bbl $ / Barrel | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) bbl $ / Barrel | Sep. 30, 2014 USD ($)
Derivative Liability, Fair Value, Net [Abstract] |  |  |  |
Realized gain (loss) on risk management activities | $ 33 | $ (84) | $ (106) | $ (616)
Realized gain on risk management activities | 1,337 | 780 | 1,002 | 369
Total realized and unrealized risk management gain (loss) | $ 1,370 | $ 696 | $ 896 | $ (247)
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 |
Crude Oil Costless Collar 07/01/16 - 12/31/16 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Counterparty |  |  | Wells Fargo |
Basis |  |  | WTI |
Quantity (barrels per day) | bbl | 300 |  | 300 |
Crude Oil Costless Collar 07/01/16 - 12/31/16 [Member] | Put Option [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Strike Price (in dollars per barrel) | $ / Barrel | 50.00 |  | 50.00 |
Crude Oil Costless Collar 07/01/16 - 12/31/16 [Member] | Call Option [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Strike Price (in dollars per barrel) | $ / Barrel | 65.25 |  | 65.25 |
Current Assets [Member] | Crude Oil Derivative Contract [Member] |  |  |  |
Derivative Asset, Fair Value, Net [Abstract] |  |  |  |
Derivative Assets, Gross amounts of recognized assets and liabilities | $ 1,152 |  | $ 1,152 |
Derivative Asset, Gross amount offset in the Balance Sheet | (150) |  | (150) |
Derivative Asset, Net amount of assets and liabilities in the Balance sheets | 1,002 |  | 1,002 |
Current Liabilities [Member] | Crude Oil Derivative Contract [Member] |  |  |  |
Derivative Liability, Fair Value, Net [Abstract] |  |  |  |
Derivative Assets, Gross amounts of recognized assets and liabilities | 150 |  | 150 |
Derivative Asset, Gross amount offset in the Balance Sheet | (150) |  | (150) |
Derivative Asset, Net amount of assets and liabilities in the Balance sheets | $ 0 |  | $ 0 |

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