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Supplemental Information on Oil and Natural Gas Producing Activities - Calculation of Weighted Average Per Unit Prices (Unaudited) (Details) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Oil Reserves |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Weighted Average Sales Price (per barrel for Oil and NGLs/per Mcf for Natural Gas) | 95.67 | 91.65 | 91.35
Natural Gas Liquids |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Weighted Average Sales Price (per barrel for Oil and NGLs/per Mcf for Natural Gas) | 31.40 | 32.64 | 46.33
Natural Gas |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Weighted Average Sales Price (per barrel for Oil and NGLs/per Mcf for Natural Gas) | 3.65 | 2.29 | 4.06

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- Definition Based upon 12-month average market prices at year-end adjusted for fixed or determinable contracts that are in existence at year-end. + References No definition available. + Details
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