XML 71 R38.htm IDEA: XBRL DOCUMENT v2.4.1.9
Long-Term Debt (Details) (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
Oct. 27, 2014
Banks
Nov. 30, 2011
Bank Borrowings                  
Long-Term Debt $ 1,074,534,000us-gaap_LongTermDebtNoncurrent [1] $ 1,142,368,000us-gaap_LongTermDebtNoncurrent [1]   $ 1,074,534,000us-gaap_LongTermDebtNoncurrent [1]          
Capitalized interest on our unproved properties 5,000,000us-gaap_InterestCostsCapitalized 7,200,000us-gaap_InterestCostsCapitalized 7,900,000us-gaap_InterestCostsCapitalized            
Number of syndicated banks               11sfy_NumberOfSyndicatedBanks  
Current Borrowing base               417,600,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity  
Maximum availability aggregate facility amount               500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity  
Line of Credit, Current Commitment Amount               417,600,000sfy_LineOfCreditCurrentCommitmentAmount  
Interest expense including commitment fees and amortization of debt issuance costs relating to the credit facility 73,207,000us-gaap_InterestExpense 69,382,000us-gaap_InterestExpense 57,303,000us-gaap_InterestExpense            
Line of Credit [Member]                  
Bank Borrowings                  
Long-Term Debt 197,300,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		 265,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		   197,300,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		          
Percentage of applicable margin with federal fund rate 0.50%sfy_PercentageOfApplicableMarginWithFederalFundRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		                
Percentage of applicable margin with LIBOR 1.00%sfy_PercentageOfApplicableMarginWithLibor
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		                
Lead bank's prime rate 3.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		                
Maximum level of cash dividends in any fiscal year 15,000,000us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		     15,000,000us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		          
Aggregate limitation on purchases of stock 50,000,000us-gaap_EquityRestrictions
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		     50,000,000us-gaap_EquityRestrictions
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		          
Line of Credit, Working Capital Ratio Required       1.0sfy_LineofCreditCovenantWorkingCapitalRatioMinimum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		          
Line of Credit, Covenant, Working Capital Ratio, Company Actual       1.9sfy_DebtInstrumentCovenantWorkingCapitalRatioCompanyActual
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		          
Line of Credit, Covenant, Interest Coverage Ratio, Required       2.75sfy_DebtInstrumentCovenantInterestCoverageRatioMinimum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		          
Line of Credit, Covenant, Interest Coverage Ratio, Company Actual       4.9sfy_DebtInstrumentCovenantInterestCoverageRatioCompanyActual
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		          
Line of Credit, Required Security Interest on Oil and Gas Properties 75.00%sfy_LineofCreditRequiredSecurityInterestonOilandGasProperties
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		                
Interest expense including commitment fees and amortization of debt issuance costs relating to the credit facility 7,500,000us-gaap_InterestExpense
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		 6,000,000us-gaap_InterestExpense
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		 3,700,000us-gaap_InterestExpense
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		            
Commitment fees included in interest expense, net 800,000us-gaap_LineOfCreditFacilityCommitmentFeeAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		 1,100,000us-gaap_LineOfCreditFacilityCommitmentFeeAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		 1,400,000us-gaap_LineOfCreditFacilityCommitmentFeeAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		            
Senior Notes                  
Debt Issuance Cost       2,300,000us-gaap_DebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		          
Line of Credit [Member] | Minimum [Member]                  
Bank Borrowings                  
Line of Credit Facility, Commitment Fee Percentage 0.375%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		                
Line of Credit [Member] | Minimum [Member] | Alternative Base Interest Rate [Member]                  
Bank Borrowings                  
Debt Instrument escalating basis spread on base rate 50sfy_DebtInstrumentEscalatingBasisSpreadonBaseRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember		                
Line of Credit [Member] | Minimum [Member] | Eurodollar Interest Rate [Member]                  
Bank Borrowings                  
Debt instrument escalating rates for eurodollar rate loans 150sfy_DebtInstrumentEscalatingRatesforEurodollarRateLoans
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_EurodollarMember		                
Line of Credit [Member] | Maximum [Member]                  
Bank Borrowings                  
Line of Credit Facility, Commitment Fee Percentage 0.50%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                
Line of Credit [Member] | Maximum [Member] | Alternative Base Interest Rate [Member]                  
Bank Borrowings                  
Debt Instrument escalating basis spread on base rate 150sfy_DebtInstrumentEscalatingBasisSpreadonBaseRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember		                
Line of Credit [Member] | Maximum [Member] | Eurodollar Interest Rate [Member]                  
Bank Borrowings                  
Debt instrument escalating rates for eurodollar rate loans 250sfy_DebtInstrumentEscalatingRatesforEurodollarRateLoans
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_EurodollarMember		                
Senior Notes Due 2017 [Member] | Senior Notes [Member]                  
Bank Borrowings                  
Long-Term Debt 250,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 250,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		   250,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		          
Maturities on long-term debt 2017 250,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		     250,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		          
Interest expense including commitment fees and amortization of debt issuance costs relating to the credit facility 18,300,000us-gaap_InterestExpense
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 18,300,000us-gaap_InterestExpense
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 18,200,000us-gaap_InterestExpense
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		            
Senior Notes                  
Senior notes, issued         250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Stated rate of senior notes         7.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Percentage at which senior notes are issued, of par value         100.00%sfy_PercentageAtWhichSeniorNotesAreIssuedAtPar
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Debt Issuance Cost       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		        
Holder right to require company to repurchase notes at purchase price in cash         101.00%sfy_HolderRightToRequireCompanyToRepurchaseNotesAtPurchasePriceInCash
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Senior Notes Due 2017 [Member] | Debt Instrument, Redemption, Period One [Member] | Senior Notes [Member]                  
Senior Notes                  
Debt Instrument, Redemption Price, Percentage         101.188%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2017Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Senior Notes Due 2017 [Member] | Debt Instrument, Redemption, Period Two [Member] | Senior Notes [Member]                  
Senior Notes                  
Debt Instrument, Redemption Price, Percentage         100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2017Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Senior Notes Due 2020 [Member] | Senior Notes [Member]                  
Bank Borrowings                  
Long-Term Debt 222,775,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 [1] 222,446,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 [1]   222,775,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 [1]          
Maturities on long-term debt 2020 & 2022 225,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		     225,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		          
Interest expense including commitment fees and amortization of debt issuance costs relating to the credit facility 20,800,000us-gaap_InterestExpense
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 20,700,000us-gaap_InterestExpense
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 20,600,000us-gaap_InterestExpense
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		            
Senior Notes                  
Senior notes, issued           225,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Stated rate of senior notes           8.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Original unamortized issuance discount on senior notes           3,600,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Percentage at which senior notes are issued, of par value           98.389%sfy_PercentageAtWhichSeniorNotesAreIssuedAtPar
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Effective interest rate on senior notes including discount           9.125%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Debt Issuance Cost       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		      
Holder right to require company to repurchase notes at purchase price in cash           101.00%sfy_HolderRightToRequireCompanyToRepurchaseNotesAtPurchasePriceInCash
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Senior Notes Due 2020 [Member] | Debt Instrument, Redemption, Period One [Member] | Senior Notes [Member]                  
Senior Notes                  
Debt Instrument, Redemption Price, Percentage           104.438%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2020Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Senior Notes Due 2020 [Member] | Debt Instrument, Redemption, Period Two [Member] | Senior Notes [Member]                  
Senior Notes                  
Debt Instrument, Redemption Price, Percentage           100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2020Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Senior Notes Due 2022 [Member] | Senior Notes [Member]                  
Bank Borrowings                  
Long-Term Debt 404,459,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 [1] 404,922,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 [1]   404,459,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 [1]          
Maturities on long-term debt 2020 & 2022 400,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		     400,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		          
Interest expense including commitment fees and amortization of debt issuance costs relating to the credit facility 31,600,000us-gaap_InterestExpense
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 31,600,000us-gaap_InterestExpense
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 22,400,000us-gaap_InterestExpense
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		            
Senior Notes                  
Senior notes, issued             400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		   250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Stated rate of senior notes             7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Original unamortized issuance discount on senior notes                 2,100,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Percentage at which senior notes are issued, of par value                 99.156%sfy_PercentageAtWhichSeniorNotesAreIssuedAtPar
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Effective interest rate on senior notes including discount                 8.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Percentage of maximum redemption of principal amount of notes             35.00%sfy_MaximumRedemptionOfPrincipleAmountOfNotesWithNetProceedsOfQualifyingOfferings
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Redemption of debts with net proceeds of qualifying offerings at price above principle amount of debts             107.875%sfy_RedemptionOfDebtsWithNetProceedsOfQualifyingOfferingsAtPriceAbovePrincipleAmountOfDebts
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Debt Issuance Cost       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		    
Holder right to require company to repurchase notes at purchase price in cash             101.00%sfy_HolderRightToRequireCompanyToRepurchaseNotesAtPurchasePriceInCash
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Senior Notes Due 2022 [Member] | Debt Instrument, Redemption, Period One [Member] | Senior Notes [Member]                  
Senior Notes                  
Debt Instrument, Redemption Price, Percentage             103.938%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Senior Notes Due 2022 [Member] | Debt Instrument, Redemption, Period Two [Member] | Senior Notes [Member]                  
Senior Notes                  
Debt Instrument, Redemption Price, Percentage             100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= sfy_SeniorNotesDue2022Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Additional Senior Notes Due 2022 [Member] | Senior Notes [Member]                  
Senior Notes                  
Senior notes, issued             150,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= sfy_AdditionalSeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Percentage at which senior notes are issued, of par value             105.00%sfy_PercentageAtWhichSeniorNotesAreIssuedAtPar
/ us-gaap_DebtInstrumentAxis
= sfy_AdditionalSeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Effective interest rate on senior notes including discount             6.993%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= sfy_AdditionalSeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Original Unamortized Premium             $ 7,500,000us-gaap_DebtInstrumentUnamortizedPremium
/ us-gaap_DebtInstrumentAxis
= sfy_AdditionalSeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
[1] Amounts are shown net of any debt discount or premium