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Provision (Benefit) for Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliations of income taxes computed using the U.S. Federal statutory rate to the effective income tax rates      
Income taxes (or benefits) computed at U.S. statutory rate -35% $ (151,714)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 69us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 13,221us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State tax provisions (benefits), net of federal benefits (5,935)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (184)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (950)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Non-deductible equity compensation 666us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 1,127us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 1,911us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Stock-based compensation tax shortfall 2,409us-gaap_IncomeTaxReconciliationNondeductibleExpense 558us-gaap_IncomeTaxReconciliationNondeductibleExpense 0us-gaap_IncomeTaxReconciliationNondeductibleExpense
Valuation allowance of carryover tax assets 4,635us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 385us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 2,370us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Expired Operating Loss Carryovers 288sfy_ExpiredOperatingLossCarryovers 400sfy_ExpiredOperatingLossCarryovers 0sfy_ExpiredOperatingLossCarryovers
Uncertain Tax Positions 0us-gaap_IncomeTaxReconciliationOtherAdjustments 0us-gaap_IncomeTaxReconciliationOtherAdjustments (977)us-gaap_IncomeTaxReconciliationOtherAdjustments
Other, net (392)us-gaap_IncomeTaxReconciliationOtherReconcilingItems 285us-gaap_IncomeTaxReconciliationOtherReconcilingItems 497us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Income tax provision (benefit) $ (150,043)us-gaap_IncomeTaxExpenseBenefit $ 2,640us-gaap_IncomeTaxExpenseBenefit $ 16,072us-gaap_IncomeTaxExpenseBenefit
Effective rate 34.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 1333.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations 42.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations