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

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- Definition Amount of real estate acquired, at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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