XML 21 R40.htm IDEA: XBRL DOCUMENT
v3.19.3

Stock-based Employee Compensation, Stock Option Plans, and Deferred Compensation Plan for Directors - Stock Options Issued (Details) | 9 Months Ended
--- | ---
Sep. 30, 2019 $ / shares
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Exercise price (in usd per share) | $ 45.11
Directors | 5/11/2018 |
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Exercise price (in usd per share) | $ 49.46
Volatility (percentage) | 0.192
Expected life (years) | 5 years
Assumed yield (percentage) | 3.70%
Risk-free rate (percentage) | 2.84%
Directors | 5/3/2019 |
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Exercise price (in usd per share) | $ 55.71
Volatility (percentage) | 0.236
Expected life (years) | 5 years
Assumed yield (percentage) | 3.75%
Risk-free rate (percentage) | 2.33%
Officers | 5/11/2018 |
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Exercise price (in usd per share) | $ 49.46
Volatility (percentage) | 0.177
Expected life (years) | 7 years
Assumed yield (percentage) | 3.75%
Risk-free rate (percentage) | 2.94%
Officers | 5/3/2019 |
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Exercise price (in usd per share) | $ 55.71
Volatility (percentage) | 0.206
Expected life (years) | 7 years
Assumed yield (percentage) | 3.80%
Risk-free rate (percentage) | 2.43%

X
- Definition Share Based Compensation Arrangement by Share Based Payment Award, Fair Value Assumptions, Volatility + References No definition available. + Details
Name: | bfs_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsVolatility
Namespace Prefix: | bfs_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] + References No definition available. + Details
Name: | bfs_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsLineItems
Namespace Prefix: | bfs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_TitleOfIndividualAxis=srt_DirectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_PeriodAxis=bfs_May112018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_PeriodAxis=bfs_May32019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=srt_OfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |