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Consolidated Statements of Stockholders' Equity (USD $) In Thousands, unless otherwise specified | Total | Series A Preferred Stock | Series B Preferred Stock | Series C Preferred Stock | Preferred Stock | Preferred Stock Series A Preferred Stock | Preferred Stock Series B Preferred Stock | Preferred Stock Series C Preferred Stock | Common Stock | Additional Paid-in Capital | Additional Paid-in Capital Series A Preferred Stock | Additional Paid-in Capital Series B Preferred Stock | Additional Paid-in Capital Series C Preferred Stock | Accumulated Deficit | Accumulated Deficit Series A Preferred Stock | Accumulated Deficit Series B Preferred Stock | Accumulated Other Comprehensive (Loss) | Total Saul Centers, Inc. | Total Saul Centers, Inc. Series A Preferred Stock | Total Saul Centers, Inc. Series B Preferred Stock | Total Saul Centers, Inc. Series C Preferred Stock | Noncontrolling Interest | Dividend Paid | Dividend Paid Series A Preferred Stock | Dividend Paid Series B Preferred Stock | Dividend Paid Series C Preferred Stock | Dividend Paid Accumulated Deficit | Dividend Paid Accumulated Deficit Series A Preferred Stock | Dividend Paid Accumulated Deficit Series B Preferred Stock | Dividend Paid Accumulated Deficit Series C Preferred Stock | Dividend Paid Total Saul Centers, Inc. | Dividend Paid Total Saul Centers, Inc. Series A Preferred Stock | Dividend Paid Total Saul Centers, Inc. Series B Preferred Stock | Dividend Paid Total Saul Centers, Inc. Series C Preferred Stock | Dividend Paid Noncontrolling Interest | Dividend Declared | Dividend Declared Series A Preferred Stock | Dividend Declared Series B Preferred Stock | Dividend Declared Accumulated Deficit | Dividend Declared Accumulated Deficit Series A Preferred Stock | Dividend Declared Accumulated Deficit Series B Preferred Stock | Dividend Declared Total Saul Centers, Inc. | Dividend Declared Total Saul Centers, Inc. Series A Preferred Stock | Dividend Declared Total Saul Centers, Inc. Series B Preferred Stock | Dividend Declared Noncontrolling Interest
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Beginning Balance at Dec. 31, 2011 | $ 293,206 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  | $ 179,328 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  | $ 193 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 217,829 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | $ (144,659)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | $ (2,863)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 249,828 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | $ 43,378 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pursuant to dividend reinvestment plan | 23,130 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan |  |  |  |  |  |  |  | 6 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 23,124 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  | 23,130 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of employee stock options and issuance of directors' deferred stock | 5,606 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation |  |  |  |  |  |  |  | 2 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 5,604 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  | 5,606 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 39,780 us-gaap_ProfitLoss |  |  |  |  |  |  |  |  |  |  |  |  | 33,374 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | 33,374 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | 6,406 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in unrealized loss on cash flow hedge | (932)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (690)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (690)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | (242)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock distributions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,000)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | (5,355)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  | (6,000)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (5,355)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (6,000)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | (5,355)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | (2,000)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | (1,785)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  | (2,000)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (1,785)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (2,000)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | (1,785)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |
Common stock distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (28,656)us-gaap_DividendsCommonStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember |  |  |  | (21,189)us-gaap_DividendsCommonStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | (21,189)us-gaap_DividendsCommonStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | (7,467)us-gaap_DividendsCommonStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |
Distributions payable preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions payable common stock and distributions payable partnership units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,705)us-gaap_DividendsCommonStock / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember |  |  | (7,216)us-gaap_DividendsCommonStock / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (7,216)us-gaap_DividendsCommonStock / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  | (2,489)us-gaap_DividendsCommonStock / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Ending Balance at Dec. 31, 2012 | 307,289 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  | 179,328 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  | 201 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 246,557 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (154,830)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (3,553)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 267,703 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | 39,586 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares of Series C preferred stock |  |  |  | 135,193 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  | 140,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  | (4,807)us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  | 135,193 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred stock |  | (60,004)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | (79,333)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  | (60,000)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | (79,328)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  | 2,212 us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 3,007 us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (2,216)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (3,012)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (60,004)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | (79,333)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pursuant to dividend reinvestment plan | 20,672 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan |  |  |  |  |  |  |  | 5 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 20,667 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  | 20,672 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of employee stock options and issuance of directors' deferred stock | 2,792 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation |  |  |  |  |  |  |  |  | 2,792 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  | 2,792 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of partnership units pursuant to dividend reinvestment plan | 4,144 bfs_LimitedPartnersUnitsIssuedDuringPeriodValueDividendReinvestmentPlan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,144 bfs_LimitedPartnersUnitsIssuedDuringPeriodValueDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 34,842 us-gaap_ProfitLoss |  |  |  |  |  |  |  |  |  |  |  |  | 30,872 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | 30,872 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | 3,970 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in unrealized loss on cash flow hedge | 2,897 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,161 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 2,161 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | 736 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock distributions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,213)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | (1,468)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | (6,095)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  | (3,213)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (1,468)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (6,095)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (3,213)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | (1,468)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | (6,095)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  | (800)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | (2,406)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  | (800)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (2,406)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (800)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | (2,406)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |
Common stock distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (29,455)us-gaap_DividendsCommonStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember |  |  |  | (21,988)us-gaap_DividendsCommonStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | (21,988)us-gaap_DividendsCommonStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | (7,467)us-gaap_DividendsCommonStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |
Distributions payable preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions payable common stock and distributions payable partnership units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,929)us-gaap_DividendsCommonStock / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember |  |  | (7,408)us-gaap_DividendsCommonStock / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (7,408)us-gaap_DividendsCommonStock / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  | (2,521)us-gaap_DividendsCommonStock / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Ending Balance at Dec. 31, 2013 | 315,126 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  | 180,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  | 206 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 270,428 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (172,564)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (1,392)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 276,678 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | 38,448 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares of Series C preferred stock |  |  |  | 39,260 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  | 40,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  | (740)us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  | 39,260 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred stock |  | (40,000)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  | (40,000)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  | 1,475 us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (1,475)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | (40,000)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pursuant to dividend reinvestment plan | 9,264 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan |  |  |  |  |  |  |  | 2 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 9,262 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  | 9,264 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of employee stock options and issuance of directors' deferred stock | 7,571 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation |  |  |  |  |  |  |  | 1 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 7,570 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  | 7,571 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of partnership units pursuant to dividend reinvestment plan | 8,877 bfs_LimitedPartnersUnitsIssuedDuringPeriodValueDividendReinvestmentPlan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,877 bfs_LimitedPartnersUnitsIssuedDuringPeriodValueDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 57,988 us-gaap_ProfitLoss |  |  |  |  |  |  |  |  |  |  |  |  | 46,943 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | 46,943 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | 11,045 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in unrealized loss on cash flow hedge | (675)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (502)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (502)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | (173)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock distributions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,049)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  | (7,219)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  | (3,049)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (7,219)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (3,049)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  | (7,219)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | (3,094)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  | (3,094)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (3,094)us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |
Common stock distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (33,534)us-gaap_DividendsCommonStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember |  |  |  | (24,937)us-gaap_DividendsCommonStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | (24,937)us-gaap_DividendsCommonStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | (8,597)us-gaap_DividendsCommonStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |
Distributions payable preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions payable common stock and distributions payable partnership units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,258)us-gaap_DividendsCommonStock / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember |  |  | (8,379)us-gaap_DividendsCommonStock / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (8,379)us-gaap_DividendsCommonStock / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  | (2,879)us-gaap_DividendsCommonStock / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Ending Balance at Dec. 31, 2014 | $ 339,257 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  | $ 180,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  | $ 209 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 287,995 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | $ (173,774)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | $ (1,894)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 292,536 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | $ 46,721 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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