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Fair Value Measurements (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Carrying Value, net of discount | 2017 Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt value $ 348,669us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= sogc_SeniorNotes2017Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 $ 348,040us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= sogc_SeniorNotes2017Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Carrying Value, net of discount | 2019 Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt value 293,064us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= sogc_SeniorNotes2019Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		  
Carrying Value, net of discount | 2020 Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt value 105,234us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= sogc_SeniorNotes2020Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		  
Fair Value | 2017 Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt value 190,400us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= sogc_SeniorNotes2017Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 327,698us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= sogc_SeniorNotes2017Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value | 2019 Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt value 184,932us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= sogc_SeniorNotes2019Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		  
Fair Value | 2020 Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt value $ 73,311us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= sogc_SeniorNotes2020Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember