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Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) (USD $) | 3 Months Ended
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Mar. 31, 2015
Issuance of stock, shares | 110,167 us-gaap_StockIssuedDuringPeriodSharesNewIssues
Pursuant to dividend reinvestment plan, shares | 42,975 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
Exercise of employee stock options and issuance of directors' deferred stock, shares | 67,192 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
Issuance of partnership units, shares | 20,796 bfs_PartnershipUnitsIssuedDuringPeriod
Distributions payable common stock, per share (in usd per share) | $ 0.43 us-gaap_CommonStockDividendsPerShareDeclared
Dividend Declared |
Distributions payable common stock, per share (in usd per share) | $ 0.43 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember
Distributions partnership units, per unit (in usd per unit) | $ 0.43 us-gaap_DistributionsPerLimitedPartnershipUnitOutstanding / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember
Series C Preferred Stock | Dividend Declared |
Preferred stock, per share (in usd per share) | $ 42.97 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Cash dividends declared or paid to each outstanding limited partnership unit during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F + Details
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- Definition Aggregate dividends declared during the period for each share of preferred stock outstanding. + References No definition available. + Details
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- Definition Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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