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Commodity Price Risk Management (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 9 Months Ended
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Sep. 30, 2012 bbl
Current Asset [Member] | Crude oil costless collars [Member] |
Derivatives, Fair Value [Line Items] |
Derivative Assets, Fair Value | 635
Current Liability [Member] | Crude oil costless collars [Member] |
Derivatives, Fair Value [Line Items] |
Derivative Liabilities, Fair Value | 0
Commodity Contract [Member] | Subsequent Event [Member] |
Derivative [Line Items] |
Number of commodity derivative contracts | 3
Crude Oil Costless Collar 01/01/12 - 12/31/12 [Member] |
Derivative [Line Items] |
Counterparty | BNP Parabis
Basis | WTI
Quantity (barrels per day) | 200
Crude Oil Costless Collar 01/01/12 - 12/31/12 [Member] | Put Option [Member] |
Derivative [Line Items] |
Strike Price (in dollars per barrel) | 90.00
Crude Oil Costless Collar 01/01/12 - 12/31/12 [Member] | Call Option [Member] |
Derivative [Line Items] |
Strike Price (in dollars per barrel) | 106.50
Crude Oil Costless Collar 10/01/12 - 03/31/13 [Member] |
Derivative [Line Items] |
Counterparty | Wells Fargo
Basis | WTI
Quantity (barrels per day) | 200
Crude Oil Costless Collar 10/01/12 - 03/31/13 [Member] | Put Option [Member] |
Derivative [Line Items] |
Strike Price (in dollars per barrel) | 85.00
Crude Oil Costless Collar 10/01/12 - 03/31/13 [Member] | Call Option [Member] |
Derivative [Line Items] |
Strike Price (in dollars per barrel) | 101.00
Crude Oil Costless Collar 01/01/13 - 06/30/13 [Member] |
Derivative [Line Items] |
Counterparty | Wells Fargo
Basis | WTI
Quantity (barrels per day) | 200
Crude Oil Costless Collar 01/01/13 - 06/30/13 [Member] | Put Option [Member] |
Derivative [Line Items] |
Strike Price (in dollars per barrel) | 90.00
Crude Oil Costless Collar 01/01/13 - 06/30/13 [Member] | Call Option [Member] |
Derivative [Line Items] |
Strike Price (in dollars per barrel) | 105.75
Crude Oil Costless Collar 10/01/12 - 09/30/13 [Member] |
Derivative [Line Items] |
Counterparty | BNP Parabis
Basis | WTI
Quantity (barrels per day) | 200
Crude Oil Costless Collar 10/01/12 - 09/30/13 [Member] | Put Option [Member] |
Derivative [Line Items] |
Strike Price (in dollars per barrel) | 95.00
Crude Oil Costless Collar 10/01/12 - 09/30/13 [Member] | Call Option [Member] |
Derivative [Line Items] |
Strike Price (in dollars per barrel) | 116.60
Crude Oil Costless Collar 04/01/13 - 06/30/13 [Member] | Subsequent Event [Member] |
Derivative [Line Items] |
Counterparty | Wells Fargo
Basis | WTI
Quantity (barrels per day) | 200
Crude Oil Costless Collar 04/01/13 - 06/30/13 [Member] | Put Option [Member] | Subsequent Event [Member] |
Derivative [Line Items] |
Strike Price (in dollars per barrel) | 90.00
Crude Oil Costless Collar 04/01/13 - 06/30/13 [Member] | Call Option [Member] | Subsequent Event [Member] |
Derivative [Line Items] |
Strike Price (in dollars per barrel) | 97.50
Crude Oil Costless Collar 06/01/13 - 09/30/13 [Member] | Subsequent Event [Member] |
Derivative [Line Items] |
Counterparty | Wells Fargo
Basis | WTI
Quantity (barrels per day) | 400
Crude Oil Costless Collar 06/01/13 - 09/30/13 [Member] | Put Option [Member] | Subsequent Event [Member] |
Derivative [Line Items] |
Strike Price (in dollars per barrel) | 90.00
Crude Oil Costless Collar 06/01/13 - 09/30/13 [Member] | Call Option [Member] | Subsequent Event [Member] |
Derivative [Line Items] |
Strike Price (in dollars per barrel) | 97.50
Crude Oil Costless Collar 10/01/13 - 12/31/13 [Member] | Subsequent Event [Member] |
Derivative [Line Items] |
Counterparty | Wells Fargo
Basis | WTI
Quantity (barrels per day) | 600
Crude Oil Costless Collar 10/01/13 - 12/31/13 [Member] | Put Option [Member] | Subsequent Event [Member] |
Derivative [Line Items] |
Strike Price (in dollars per barrel) | 90.00
Crude Oil Costless Collar 10/01/13 - 12/31/13 [Member] | Call Option [Member] | Subsequent Event [Member] |
Derivative [Line Items] |
Strike Price (in dollars per barrel) | 97.50

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- Definition Identification of the name or type of counterparty to the derivative instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A -Footnote 1 + Details
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- Definition Reference to the index or unit of measurement for the underlying which establishes the pricing terms of the derivative instrument. For example, the basis on the underlying for a natural gas futures contract might be the NYMEX price per million British thermal units (MMBtu). + References No definition available. + Details
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