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Real Estate Acquired and Sold - Purchase Price Allocation (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Business Acquisition [Line Items]
Land	$ 66,048us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
Buildings	4,874us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
Below Market Rent	5,070bfs_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowMarketLease
Total Purchase Price	67,950us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
In-place Leases
Business Acquisition [Line Items]
Finite-lived Intangibles	2,099us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember
Above Market Rent
Business Acquisition [Line Items]
Finite-lived Intangibles	0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember
1580 Rockville Pike
Business Acquisition [Line Items]
Land	9,600us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightZeroRockvillePikeMember
Buildings	2,200us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightZeroRockvillePikeMember
Below Market Rent	4,313bfs_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowMarketLease / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightZeroRockvillePikeMember
Total Purchase Price	8,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightZeroRockvillePikeMember
1580 Rockville Pike | In-place Leases
Business Acquisition [Line Items]
Finite-lived Intangibles	513us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightZeroRockvillePikeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember
1580 Rockville Pike | Above Market Rent
Business Acquisition [Line Items]
Finite-lived Intangibles	0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightZeroRockvillePikeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember
1582 Rockville Pike
Business Acquisition [Line Items]
Land	9,742us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightTwoRockvillePikeMember
Buildings	828us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightTwoRockvillePikeMember
Below Market Rent	419bfs_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowMarketLease / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightTwoRockvillePikeMember
Total Purchase Price	11,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightTwoRockvillePikeMember
1582 Rockville Pike | In-place Leases
Business Acquisition [Line Items]
Finite-lived Intangibles	849us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightTwoRockvillePikeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember
1582 Rockville Pike | Above Market Rent
Business Acquisition [Line Items]
Finite-lived Intangibles	0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightTwoRockvillePikeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember
750 N. Glebe Road
Business Acquisition [Line Items]
Land	38,224us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = bfs_SevenFiftyNGlebeRoadMember
Buildings	1,327us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = bfs_SevenFiftyNGlebeRoadMember
Below Market Rent	0bfs_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowMarketLease / us-gaap_BusinessAcquisitionAxis = bfs_SevenFiftyNGlebeRoadMember
Total Purchase Price	40,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bfs_SevenFiftyNGlebeRoadMember
750 N. Glebe Road | In-place Leases
Business Acquisition [Line Items]
Finite-lived Intangibles	449us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_SevenFiftyNGlebeRoadMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember
750 N. Glebe Road | Above Market Rent
Business Acquisition [Line Items]
Finite-lived Intangibles	0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_SevenFiftyNGlebeRoadMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember
730 N. Glebe Road
Business Acquisition [Line Items]
Land	2,683us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = bfs_SevenThirtyNGlebeRoadMember
Buildings	78us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = bfs_SevenThirtyNGlebeRoadMember
Below Market Rent	0bfs_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowMarketLease / us-gaap_BusinessAcquisitionAxis = bfs_SevenThirtyNGlebeRoadMember
Total Purchase Price	2,800us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bfs_SevenThirtyNGlebeRoadMember
730 N. Glebe Road | In-place Leases
Business Acquisition [Line Items]
Finite-lived Intangibles	39us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_SevenThirtyNGlebeRoadMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember
730 N. Glebe Road | Above Market Rent
Business Acquisition [Line Items]
Finite-lived Intangibles	0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_SevenThirtyNGlebeRoadMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember
1584 Rockville Pike
Business Acquisition [Line Items]
Land	5,798us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightFourRockvillePikeMember
Buildings	440us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightFourRockvillePikeMember
Below Market Rent	337bfs_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBelowMarketLease / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightFourRockvillePikeMember
Total Purchase Price	6,150us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightFourRockvillePikeMember
1584 Rockville Pike | In-place Leases
Business Acquisition [Line Items]
Finite-lived Intangibles	249us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightFourRockvillePikeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember
1584 Rockville Pike | Above Market Rent
Business Acquisition [Line Items]
Finite-lived Intangibles	$ 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bfs_OneFiveEightFourRockvillePikeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember

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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Below Market Lease

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Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 20

-Section 50

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