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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, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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) | 91.65 sd_WeightedAverageSalesPrice / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_OilReservesMember | 95.67 sd_WeightedAverageSalesPrice / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_OilReservesMember | 91.65 sd_WeightedAverageSalesPrice / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_OilReservesMember
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) | 32.79 sd_WeightedAverageSalesPrice / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasLiquidsReservesMember | 31.40 sd_WeightedAverageSalesPrice / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasLiquidsReservesMember | 32.64 sd_WeightedAverageSalesPrice / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasLiquidsReservesMember
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) | 3.61 sd_WeightedAverageSalesPrice / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | 3.65 sd_WeightedAverageSalesPrice / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | 2.29 sd_WeightedAverageSalesPrice / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember

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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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- Details
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- Details
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- Details
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