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Summary of Significant Accounting Policies (Details Textual) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Jun. 01, 2007
Nov. 25, 2009
Oct. 03, 2012
Jul. 15, 2014
acre
Summary of Significant Accounting Policies (Textual) [Abstract]                
Total capitalized internal costs $ 26,300,000sfy_CapitalizedCostsOilAndGasProducingActivities $ 31,800,000sfy_CapitalizedCostsOilAndGasProducingActivities $ 31,100,000sfy_CapitalizedCostsOilAndGasProducingActivities          
Discount rate for estimated future net revenues from proved properties 10.00%sfy_DiscountRateForEstimatedFutureNetRevenuesFromProvedProperties              
Write-down of oil and gas properties 445,396,000us-gaap_ImpairmentOfOilAndGasProperties 46,948,000us-gaap_ImpairmentOfOilAndGasProperties 0us-gaap_ImpairmentOfOilAndGasProperties          
Allowance for doubtful accounts receivable, current 100,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 100,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent   100,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent        
Trade Accounts Receivable, Gross 34,800,000us-gaap_AccountsReceivableGrossCurrent 56,900,000us-gaap_AccountsReceivableGrossCurrent   34,800,000us-gaap_AccountsReceivableGrossCurrent        
Accounts receivable related to joint interest owners 8,400,000us-gaap_OilAndGasJointInterestBillingReceivables 1,600,000us-gaap_OilAndGasJointInterestBillingReceivables   8,400,000us-gaap_OilAndGasJointInterestBillingReceivables        
Severance Tax Receivables 3,100,000sfy_SeveranceTaxReceivables 11,600,000sfy_SeveranceTaxReceivables   3,100,000sfy_SeveranceTaxReceivables        
Other Receivables 2,200,000us-gaap_OtherReceivables 800,000us-gaap_OtherReceivables   2,200,000us-gaap_OtherReceivables        
Gain (loss) on Price Risk Derivatives, Net 1,300,000us-gaap_GainLossOnPriceRiskDerivativesNet (900,000)us-gaap_GainLossOnPriceRiskDerivativesNet 2,300,000us-gaap_GainLossOnPriceRiskDerivativesNet          
Derivative Asset, Fair Value, Gross Asset 2,500,000us-gaap_DerivativeFairValueOfDerivativeAsset     2,500,000us-gaap_DerivativeFairValueOfDerivativeAsset        
Derivative Liability, Fair Value, Gross Liability 100,000us-gaap_DerivativeFairValueOfDerivativeLiability     100,000us-gaap_DerivativeFairValueOfDerivativeLiability        
Derivative, Fair Value, Net 2,400,000us-gaap_DerivativeFairValueOfDerivativeNet     2,400,000us-gaap_DerivativeFairValueOfDerivativeNet        
Receivables, Fair Value Disclosure 1,000,000us-gaap_ReceivablesFairValueDisclosure     1,000,000us-gaap_ReceivablesFairValueDisclosure        
Percentage of working interest in wells 100.00%sfy_PercentageOfWorkingInterestInterestInWells              
Total amount of supervision fees charged to wells 12,700,000sfy_SupervisionFees 11,600,000sfy_SupervisionFees 11,300,000sfy_SupervisionFees          
Inventories carried at cost 3,100,000us-gaap_WeightedAverageCostInventoryAmount 3,500,000us-gaap_WeightedAverageCostInventoryAmount   3,100,000us-gaap_WeightedAverageCostInventoryAmount        
Prepaid Expense 3,900,000us-gaap_PrepaidExpenseCurrentAndNoncurrent 3,300,000us-gaap_PrepaidExpenseCurrentAndNoncurrent   3,900,000us-gaap_PrepaidExpenseCurrentAndNoncurrent        
Outstanding checks included in trade accounts payable 13,700,000us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent 26,100,000us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent   13,700,000us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent        
Acreage Sold in Oil and Gas Properties               8,300sfy_AcreageSoldinOilandGasProperties
Participation Interest Sold in Oil and Gas Properties               36.00%sfy_ParticipationInterestSoldinOilandGasProperties
Increase in Restricted Cash in Operating Activities 29,800,000sfy_IncreaseinRestrictedCashinOperatingActivities              
Decrease in Restricted Cash in Operating Activities 7,100,000sfy_DecreaseinRestrictedCashinOperatingActivities              
Restricted cash and cash equivalents included in other long term assets 1,000,000us-gaap_RestrictedCashAndCashEquivalentsNoncurrent 1,000,000us-gaap_RestrictedCashAndCashEquivalentsNoncurrent   1,000,000us-gaap_RestrictedCashAndCashEquivalentsNoncurrent        
Asset Retirement Obligation - current portion 10,709,000us-gaap_AssetRetirementObligationCurrent 15,859,000us-gaap_AssetRetirementObligationCurrent   10,709,000us-gaap_AssetRetirementObligationCurrent        
Shell Oil Company Concentration Risk [Member]                
Summary of Significant Accounting Policies (Textual) [Abstract]                
Concentration Risk, Percentage 21.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
33.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
46.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
         
Kinder Morgan Concentration Risk [Member]                
Summary of Significant Accounting Policies (Textual) [Abstract]                
Concentration Risk, Percentage 20.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= sfy_KinderMorganConcentrationRiskMember
             
Plains Marketing Concentration Risk [Member]                
Summary of Significant Accounting Policies (Textual) [Abstract]                
Concentration Risk, Percentage 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= sfy_PlainsMarketingConcentrationRiskMember
             
BP America Concentration Risk [Member]                
Summary of Significant Accounting Policies (Textual) [Abstract]                
Concentration Risk, Percentage   21.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= sfy_BPAmericaConcentrationRiskMember
           
Southcross Energy Concentration Risk [Member]                
Summary of Significant Accounting Policies (Textual) [Abstract]                
Concentration Risk, Percentage     11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= sfy_SouthcrossEnergyConcentrationRiskMember
         
Line of Credit [Member]                
Summary of Significant Accounting Policies (Textual) [Abstract]                
Balance of issuance costs for credit facility       2,300,000us-gaap_DebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
       
Minimum [Member]                
Summary of Significant Accounting Policies (Textual) [Abstract]                
Property, Plant and Equipment, Useful Life 2 years              
Maximum [Member]                
Summary of Significant Accounting Policies (Textual) [Abstract]                
Property, Plant and Equipment, Useful Life   20 years            
Senior Notes Due 2017 [Member] | Senior Notes [Member]                
Summary of Significant Accounting Policies (Textual) [Abstract]                
Stated Rate of Senior notes         7.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Balance of issuance costs for credit facility       1,300,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
4,200,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Senior Notes Due 2020 [Member] | Senior Notes [Member]                
Summary of Significant Accounting Policies (Textual) [Abstract]                
Stated Rate of Senior notes           8.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Balance of issuance costs for credit facility       3,100,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  5,000,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Senior Notes Due 2022 [Member] | Senior Notes [Member]                
Summary of Significant Accounting Policies (Textual) [Abstract]                
Stated Rate of Senior notes             7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Balance of issuance costs for credit facility       $ 5,900,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
    $ 7,500,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember