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Property, Plant and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oil and natural gas properties      
Proved $ 11,707,147us-gaap_CapitalizedCostsProvedProperties [1] $ 10,972,816us-gaap_CapitalizedCostsProvedProperties [1] $ 12,262,921us-gaap_CapitalizedCostsProvedProperties
Unproved 290,596us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative 531,606us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative 865,863us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative
Total oil and natural gas properties 11,997,743us-gaap_OilAndGasPropertyFullCostMethodGross 11,504,422us-gaap_OilAndGasPropertyFullCostMethodGross 13,128,784us-gaap_OilAndGasPropertyFullCostMethodGross
Less: accumulated depreciation, depletion and impairment (6,359,149)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities (5,762,969)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities (5,231,182)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities
Net oil and natural gas properties capitalized costs 5,638,594us-gaap_OilAndGasPropertyFullCostMethodNet 5,741,453us-gaap_OilAndGasPropertyFullCostMethodNet 7,897,602us-gaap_OilAndGasPropertyFullCostMethodNet
Land 16,300us-gaap_Land 18,423us-gaap_Land  
Non-oil and natural gas equipment 602,392us-gaap_MachineryAndEquipmentGross [2] 600,603us-gaap_MachineryAndEquipmentGross [2]  
Buildings and structures 263,191us-gaap_BuildingsAndImprovementsGross [3] 233,405us-gaap_BuildingsAndImprovementsGross [3]  
Total 881,883us-gaap_PropertyPlantAndEquipmentGross 852,431us-gaap_PropertyPlantAndEquipmentGross  
Less accumulated depreciation and amortization (305,420)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (286,209)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Other property, plant and equipment, net 576,463us-gaap_PropertyPlantAndEquipmentNet 566,222us-gaap_PropertyPlantAndEquipmentNet  
Total property, plant and equipment, net $ 6,215,057sd_TotalPropertyAndEquipmentNet $ 6,307,675sd_TotalPropertyAndEquipmentNet  
[1] Includes cumulative capitalized interest of approximately $38.1 million and $23.4 million at December 31, 2014 and 2013, respectively.
[2] Includes cumulative capitalized interest of approximately $4.3 million at both December 31, 2014 and 2013.
[3] Includes cumulative capitalized interest of approximately $17.1 million and $12.0 million at December 31, 2014 and 2013, respectively.