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Income Taxes (Provision For Income Taxes/(Benefit)) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Abstract]                      
Current taxes: Federal                 $ 100,262us-gaap_CurrentFederalTaxExpenseBenefit $ 26,695us-gaap_CurrentFederalTaxExpenseBenefit $ 32,111us-gaap_CurrentFederalTaxExpenseBenefit
Current taxes: State                 21,835us-gaap_CurrentStateAndLocalTaxExpenseBenefit 9,954us-gaap_CurrentStateAndLocalTaxExpenseBenefit 9,199us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current taxes: Foreign                 (1,831)us-gaap_CurrentForeignTaxExpenseBenefit 365us-gaap_CurrentForeignTaxExpenseBenefit (174)us-gaap_CurrentForeignTaxExpenseBenefit
Current taxes: Total                 120,266us-gaap_CurrentIncomeTaxExpenseBenefit 37,014us-gaap_CurrentIncomeTaxExpenseBenefit 41,136us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred taxes: Federal                 (275)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (20,724)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 35,072us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred taxes: State                 (8,064)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (2,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 8,498us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred taxes: Foreign                 (263)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (1,968)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (255)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit), Total                 (8,602)sf_DeferredIncomeTaxExpenseBenefitWithAdjustment (24,692)sf_DeferredIncomeTaxExpenseBenefitWithAdjustment 43,315sf_DeferredIncomeTaxExpenseBenefitWithAdjustment
Provision for income taxes/(benefit) $ 23,890us-gaap_IncomeTaxExpenseBenefit $ 25,673us-gaap_IncomeTaxExpenseBenefit $ 31,946us-gaap_IncomeTaxExpenseBenefit $ 30,155us-gaap_IncomeTaxExpenseBenefit $ 25,863us-gaap_IncomeTaxExpenseBenefit $ (43,921)us-gaap_IncomeTaxExpenseBenefit $ 21,659us-gaap_IncomeTaxExpenseBenefit $ 8,722us-gaap_IncomeTaxExpenseBenefit $ 111,664us-gaap_IncomeTaxExpenseBenefit $ 12,322us-gaap_IncomeTaxExpenseBenefit $ 84,451us-gaap_IncomeTaxExpenseBenefit