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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, 2015 $ / Mcf $ / bbl | Dec. 31, 2014 $ / Mcf $ / bbl | Dec. 31, 2013 $ / Mcf $ / bbl
Oil Reserves |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Weighted Average Sales Price (USD per barrel for Oil and NGLs/USD per Mcf for Natural Gas) | 45.29 | 91.65 | 95.67
Natural Gas Liquids |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Weighted Average Sales Price (USD per barrel for Oil and NGLs/USD per Mcf for Natural Gas) | 12.68 | 32.79 | 31.40
Natural Gas |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Weighted Average Sales Price (USD per barrel for Oil and NGLs/USD per Mcf for Natural Gas) | $ / Mcf | 1.87 | 3.61 | 3.65

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