XML 71 R56.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Distributions - Summary of Distributions Paid Including Activity in Plan as well as Limited Partnership Units Issued from Reinvestment of Unit Distributions (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2019 | Jul. 31, 2019 | Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,390 | $ 12,402 | $ 12,375
Common Stockholders |  |  |  |  |  |  |  |  |  |  |  |  | 48,568 | 46,306 | 44,576
Limited Partnership Unitholders |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,642 | $ 15,981 | $ 15,268
Common Stock Shares Issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 430,462,000 | 572,928 | 266,011
Limited Partnership Units Issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 60,936,000 | 107,433 | 111,351
October 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders | $ 3,531 |  |  |  | $ 2,953 |  |  |  | $ 3,094 |  |  |  |  |  |
Common Stockholders | 12,251 |  |  |  | 11,706 |  |  |  | 11,221 |  |  |  |  |  |
Limited Partnership Unitholders | $ 4,173 |  |  |  | $ 4,062 |  |  |  | $ 3,838 |  |  |  |  |  |
Common Stock Shares Issued (in shares) | 104,558,000 |  |  |  | 216,476 |  |  |  | 82,991 |  |  |  |  |  |
Discounted Share Price (in usd per share) | $ 52.84 |  |  |  | $ 49.34 |  |  |  | $ 59.33 |  |  |  |  |  |
Limited Partnership Units Issued (in shares) | 13,747,000 |  |  |  | 13,867 |  |  |  | 15,596 |  |  |  |  |  |
Average Unit Price (in usd per share) | $ 53.73 |  |  |  | $ 50.20 |  |  |  | $ 60.08 |  |  |  |  |  |
July 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  | $ 2,953 |  |  |  | $ 2,953 |  |  |  | $ 3,094 |  |  |  |  |
Common Stockholders |  | 12,195 |  |  |  | 11,590 |  |  |  | 11,160 |  |  |  |  |
Limited Partnership Unitholders |  | $ 4,166 |  |  |  | $ 4,055 |  |  |  | $ 3,830 |  |  |  |  |
Common Stock Shares Issued (in shares) |  | 105,753,000 |  |  |  | 201,500 |  |  |  | 85,731 |  |  |  |  |
Discounted Share Price (in usd per share) |  | $ 53.66 |  |  |  | $ 51.68 |  |  |  | $ 57.40 |  |  |  |  |
Limited Partnership Units Issued (in shares) |  | 13,406,000 |  |  |  | 13,107 |  |  |  | 16,021 |  |  |  |  |
Average Unit Price (in usd per share) |  | $ 54.56 |  |  |  | $ 52.60 |  |  |  | $ 58.13 |  |  |  |  |
April 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  |  | $ 2,953 |  |  |  | $ 2,672 |  |  |  | $ 3,094 |  |  |  |
Common Stockholders |  |  | 12,116 |  |  |  | 11,545 |  |  |  | 11,119 |  |  |  |
Limited Partnership Unitholders |  |  | $ 4,155 |  |  |  | $ 3,942 |  |  |  | $ 3,810 |  |  |  |
Common Stock Shares Issued (in shares) |  |  | 99,804,000 |  |  |  | 85,202 |  |  |  | 51,003 |  |  |  |
Discounted Share Price (in usd per share) |  |  | $ 51.38 |  |  |  | $ 47.54 |  |  |  | $ 59.64 |  |  |  |
Limited Partnership Units Issued (in shares) |  |  | 20,041,000 |  |  |  | 42,422 |  |  |  | 40,623 |  |  |  |
Average Unit Price (in usd per share) |  |  | $ 51.99 |  |  |  | $ 47.83 |  |  |  | $ 59.96 |  |  |  |
January 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  |  |  | $ 2,953 |  |  |  | $ 3,824 |  |  |  | $ 3,093 |  |  |
Common Stockholders |  |  |  | 12,006 |  |  |  | 11,465 |  |  |  | 11,076 |  |  |
Limited Partnership Unitholders |  |  |  | $ 4,148 |  |  |  | $ 3,922 |  |  |  | $ 3,790 |  |  |
Common Stock Shares Issued (in shares) |  |  |  | 120,347,000 |  |  |  | 69,750 |  |  |  | 46,286 |  |  |
Discounted Share Price (in usd per share) |  |  |  | $ 51.28 |  |  |  | $ 52.71 |  |  |  | $ 61.85 |  |  |
Limited Partnership Units Issued (in shares) |  |  |  | 13,742,000 |  |  |  | 38,037 |  |  |  | 39,111 |  |  |
Average Unit Price (in usd per share) |  |  |  | $ 52.16 |  |  |  | $ 53.03 |  |  |  | $ 62.15 |  |  |

X
- Definition Dividends [Line Items] + References No definition available. + Details
Name: | bfs_DividendsLineItems
Namespace Prefix: | bfs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Dividends Paid To Noncontrolling Interests + References No definition available. + Details
Name: | bfs_DividendsPaidToNoncontrollingInterests
Namespace Prefix: | bfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Dividends Reinvested in Common Stock, Price Per Share + References No definition available. + Details
Name: | bfs_DividendsReinvestedInCommonStockPricePerShare
Namespace Prefix: | bfs_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Limited Partner's Dividend Reinvestment Plan, Average Unit Price + References No definition available. + Details
Name: | bfs_LimitedPartnersDividendReinvestmentPlanAverageUnitPrice
Namespace Prefix: | bfs_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Limited Partner's Units Issued During Period, Units, Dividend Reinvestment Plan + References No definition available. + Details
Name: | bfs_LimitedPartnersUnitsIssuedDuringPeriodUnitsDividendReinvestmentPlan
Namespace Prefix: | bfs_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
Name: | us-gaap_PaymentsOfDividendsCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
Name: | us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DividendsAxis=bfs_DividendPaymentOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=bfs_DividendPaymentTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=bfs_DividendPaymentThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=bfs_DividendPaymentFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |