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Real Estate Transactions - Narrative (Details) $ in Thousands |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 09, 2018 shares | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | May 31, 2018 USD ($) a shares | Aug. 31, 2016 a | Sep. 30, 2019 USD ($) property | Sep. 30, 2018 USD ($) | Sep. 01, 2019 tenant
Real Estate [Line Items] |  |  |  |  |  |  |  |
Deferred leasing costs, net |  | $ 28,083 |  |  |  | $ 24,947 |  |
Accumulated amortization deferred leasing cost |  | 37,700 |  |  |  | 40,400 |  |
Amortization expense deferred leasing cost |  |  |  |  |  | 4,500 | $ 4,300 |
Depreciation expense |  |  |  |  |  | 30,700 | 29,700 |
Repairs and maintenance expense |  |  |  |  |  | 9,700 | 8,700 |
Payments to acquire real estate |  |  |  |  |  | 13,398 | 6,586 |
Construction in progress |  | 185,972 |  |  |  | 317,798 |  |
Real estate investments |  | 1,948,165 |  |  |  | $ 2,052,369 |  |
Shopping Centers |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  |  |  | 49 |  |
Mixed-Use Properties |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  |  |  | 6 |  |
Non-operating Development Properties |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  |  |  | 5 |  |
Ashbrook Marketplace |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Area of real estate acquired (in acres) | a |  |  |  | 13.7 |  |  |  |
Additions to real estate investments, noncash |  |  |  | $ 8,800 |  |  | 8,776 |
Acquisition costs |  |  |  | $ 200 |  |  |  |
Construction in progress |  | 11,124 |  |  |  | $ 22,570 |  |
7316 Wisconsin Avenue |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  | $ 35,500 |  |  |  |  |
Number of tenants | tenant |  |  |  |  |  |  |  | 2
Construction in progress |  | 0 |  |  |  | $ 42,626 |  |
Property acquisition costs |  |  | $ 700 |  |  |  | $ 700 |
Parcel Adjacent To 7316 Wisconsin Avenue |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Payments to acquire real estate |  | 4,500 |  |  |  |  |  |
2018 Acquisitions |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Real estate investments |  | $ 49,500 |  |  |  |  |  |
BF Saul Real Estate Investment Trust | Ashbrook Marketplace |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Limited partnership units issued for purchase (in shares) | shares | 176,680 |  |  | 176,680 |  |  |  |
Area of real estate acquired (in acres) | a |  |  |  |  | 13.7 |  |  |
Building | Minimum |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Estimated useful life (in years) |  |  |  |  |  | 35 years |  |
Building | Maximum |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Estimated useful life (in years) |  |  |  |  |  | 50 years |  |
Building Improvements | Maximum |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Estimated useful life (in years) |  |  |  |  |  | 20 years |  |

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- Definition This element represents the amortization of deferred leasing fees incurred by the lessor and amortized over the term of the lease. Such fees represent (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77902619&loc=d3e40246-112709 + Details
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- Definition This element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This element is net of accumulated amortization. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77902619&loc=d3e40246-112709 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=77902619&loc=d3e40588-112709 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77913719&loc=d3e40879-112712 + Details
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