XML 93 R82.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Senior Notes (Summary of Senior Notes) (Parenthetical) (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 27, 2017 | Jul. 31, 2016 | Mar. 31, 2018 | Dec. 31, 2017 | Oct. 31, 2017 | Dec. 31, 2015 | Jul. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  | 4.25% |  |  |  |
Long-term Debt |  |  | $ 1,015,195 | $ 1,014,940 |  |  |
Debt instrument, maturity date |  |  | Dec. 31, 2024 |  |  |  |
Senior notes 4.250% due 2024 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  | 4.25% |  |  |  | 4.25%
Long-term Debt |  |  |  |  |  |  | $ 300,000
Debt instrument, maturity date |  |  | Jul. 31, 2024 |  |  |  |
Redemption price, percentage of principal amount |  |  | 100.00% |  |  |  |
Additional issuance of long-term debt |  | $ 200,000 |  |  |  |  |
Senior notes 3.50% due 2020 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  | 3.50% |  |  | 3.50% |
Long-term Debt |  |  |  |  |  | $ 300,000 |
Debt instrument, maturity date |  |  | Dec. 31, 2020 |  |  |  |
Redemption price, percentage of principal amount |  |  | 100.00% |  |  |  |
Senior notes 5.20% due 2047 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  | 5.20% |  | 5.20% |  |
Long-term Debt |  |  |  |  | $ 200,000 |  |
Debt instrument, maturity date |  |  | Oct. 31, 2047 |  |  |  |
Redemption price, percentage of principal amount |  |  | 100.00% |  |  |  |
Additional issuance of long-term debt | $ 25,000 |  |  |  |  |  |

X
- Definition Redemption price, percentage of principal amount. + References No definition available. + Details
Name: | sf_RedemptionPricePercentageOfPrincipalAmount
Namespace Prefix: | sf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=sf_SeniorNotes4250Due2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=sf_SeniorNotes350Due2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=sf_SeniorNotes520Due2047Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |