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Commodity Price Risk Management (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |  |  |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |
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Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 Current Asset [Member] Crude Oil Costless Collars [Member] | Dec. 31, 2013 Current Asset [Member] Crude Oil Costless Collars [Member] | Mar. 31, 2014 Current Liability [Member] Crude Oil Costless Collars [Member] | Dec. 31, 2013 Current Liability [Member] Crude Oil Costless Collars [Member] | Mar. 31, 2014 Crude Oil Costless Collar 01/01/14 - 06/30/14 [Member] bbl | Mar. 31, 2014 Crude Oil Costless Collar 01/01/14 - 06/30/14 [Member] Put Option [Member] | Mar. 31, 2014 Crude Oil Costless Collar 01/01/14 - 06/30/14 [Member] Call Option [Member] | Mar. 31, 2014 Crude Oil Costless Collar 01/01/14 - 06/30/14 [Member] bbl | Mar. 31, 2014 Crude Oil Costless Collar 01/01/14 - 06/30/14 [Member] Put Option [Member] | Mar. 31, 2014 Crude Oil Costless Collar 01/01/14 - 06/30/14 [Member] Call Option [Member] | Mar. 31, 2014 Crude Oil Costless Collar 07/01/14 - 12/31/14 [Member] bbl | Mar. 31, 2014 Crude Oil Costless Collar 07/01/14 - 12/31/14 [Member] Put Option [Member] | Mar. 31, 2014 Crude Oil Costless Collar 07/01/14 - 12/31/14 [Member] Call Option [Member] | Mar. 31, 2014 Crude Oil Costless Collar 07/01/14 - 12/31/14 [Member] bbl | Mar. 31, 2014 Crude Oil Costless Collar 07/01/14 - 12/31/14 [Member] Put Option [Member] | Mar. 31, 2014 Crude Oil Costless Collar 07/01/14 - 12/31/14 [Member] Call Option [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Counterparty |  |  |  |  |  |  | Wells Fargo |  |  | Wells Fargo |  |  | Wells Fargo |  |  | Wells Fargo |  |
Basis |  |  |  |  |  |  | WTI |  |  | WTI |  |  | WTI |  |  | WTI |  |
Quantity (barrels per day) |  |  |  |  |  |  | 300 |  |  | 300 |  |  | 300 |  |  | 300 |  |
Strike Price (in dollars per barrel) |  |  |  |  |  |  |  | 90.00 | 95.00 |  | 90.00 | 97.25 |  | 90.00 | 98.40 |  | 90.00 | 97.40
Derivative Asset, Fair Value, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Assets, Gross |  |  | $ 280 | $ 345 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Asset, Gross amount offset in |  |  | (280) | (331) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Asset, Net amount of assets |  |  | 0 | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Fair Value, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Gross |  |  |  |  | 719 | 611 |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liabilities, Gross amount offset in |  |  |  |  | (280) | (331) |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Net amount of assets |  |  |  |  | 439 | 280 |  |  |  |  |  |  |  |  |  |  |  |
Realized derivative gain (loss) | (158) | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized derivative gain (loss) | (173) | (616) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total realized and unrealized derivative gain (loss) | $ (331) | $ (602) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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