XML 98 R90.htm IDEA: XBRL DOCUMENT v2.4.1.9
Senior Notes (Corporate Debt) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long-term Debt $ 625,000us-gaap_LongTermDebt $ 325,000us-gaap_LongTermDebt
Stated interest rate 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage  
Senior notes 6.70%, due 2022 [Member]    
Debt Instrument [Line Items]    
Long-term Debt 175,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= sf_SeniorNotes670Due2022Member		 [1] 175,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= sf_SeniorNotes670Due2022Member		 [1]
Stated interest rate 6.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= sf_SeniorNotes670Due2022Member		  
Debt instrument, maturity date Jan. 01, 2022  
Redemption price, percentage of principal amount 100.00%sf_RedemptionPricePercentageOfPrincipalAmount
/ us-gaap_LongtermDebtTypeAxis
= sf_SeniorNotes670Due2022Member		  
Senior notes 5.375%, due 2022 [Member]    
Debt Instrument [Line Items]    
Long-term Debt 150,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= sf_SeniorNotes5375Due2022Member		 [2] 150,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= sf_SeniorNotes5375Due2022Member		 [2]
Stated interest rate 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= sf_SeniorNotes5375Due2022Member		  
Due date December 2022  
Redemption price, percentage of principal amount 100.00%sf_RedemptionPricePercentageOfPrincipalAmount
/ us-gaap_LongtermDebtTypeAxis
= sf_SeniorNotes5375Due2022Member		  
Senior Notes 4.250% Due 2024 [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 300,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= sf_SeniorNotes425Due2024Member		  
Stated interest rate 4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= sf_SeniorNotes425Due2024Member		  
Redemption price, percentage of principal amount 100.00%sf_RedemptionPricePercentageOfPrincipalAmount
/ us-gaap_LongtermDebtTypeAxis
= sf_SeniorNotes425Due2024Member		  
[1] In January 2012, we sold in a registered underwritten public offering, $175.0 million in aggregate principal amount of 6.70% senior notes due January 2022. Interest on these senior notes is payable quarterly in arrears. On or after January 15, 2015, we may redeem some or all of the senior notes at any time at a redemption price equal to 100% of the principal amount of the notes being redeemed plus accrued interest thereon to the redemption date.
[2] In December 2012, we sold in a registered underwritten public offering, $150.0 million in aggregate principal amount of 5.375% senior notes due December 2022. Interest on these senior notes is payable quarterly in arrears. On or after December 31, 2015, we may redeem some or all of the senior notes at any time at a redemption price equal to 100% of the principal amount of the notes being redeemed plus accrued interest thereon to the redemption date.