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Leases - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) Aqreement Store | Sep. 30, 2020 USD ($) item | Jun. 30, 2020 item | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) item
Operating Leased Assets [Line Items] |  |  |  |  |
Variable lease revenues | $ 14,800 |  |  | $ 14,600 |
Operating lease right-of-use asset | 74,803 |  |  |  | $ 76,268
Lease liability - operating lease | $ 87,910 |  |  |  | 88,816
Lease agreement purchase price |  |  |  |  | 14,500
Number of sores having bankruptcies, in core portfolio | Store | 3 |  |  |  |
Core portfolio annualized base rents for stores of bankruptcies | $ 700 |  |  |  |
Core portfolio annualized base rents for stores of bankruptcies percentage | 0.60% |  |  |  |
Number of sores having bankruptcies, in fund portfolio | Store | 5 |  |  |  |
Fund portfolio annualized base rents for stores of bankruptcies | $ 600 |  |  |  |
Fund portfolio annualized base rents for stores of bankruptcies percentage | 2.70% |  |  |  |
Number of stores in core portfolio rejected lease with annualized base rents | Store | 1 |  |  |  |
Core portfolio annualized base rents for stores rejected lease | $ 100 |  |  |  |
Core portfolio annualized base rents for stores rejected lease percentage | 0.10% |  |  |  |
Number of stores assumed their locations in fund portfolio | Store | 2 |  |  |  |
Fund portfolio annualized base rents for stores assumed their locations | $ 100 |  |  |  |
Fund portfolio annualized base rents for stores assumed their locations percentage | 0.10% |  |  |  |
COVID-19 |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Number of rent concession agreements | Aqreement | 47 |  |  |  |
Number of rent concession agreements for rent deferral | Aqreement | 12 |  |  |  |
Number of rent concession agreements for rent abatements | Aqreement | 35 |  |  |  |
Number of rent concession agreements accounted as no change in contract | Aqreement | 11 |  |  |  |
Deferred receivables | $ 8,900 |  |  |  |
Rent abatements | 1,539 |  |  |  |
Rent abatements negotiated and reserved in prior periods | $ 1,200 |  |  |  |
Pro rata core leased occupancy rate percentage | 91.00% |  |  | 93.90% |
Pro rata fund leased occupancy rate percentage | 89.00% |  |  | 93.20% |
Core Portfolio | COVID-19 |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Percentage of tenants open for business | 92.40% |  |  |  |
Percentage of rent collections | 91.80% |  |  |  |
Rent abatements | $ 756 |  |  |  |
Opportunity Funds | COVID-19 |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Percentage of tenants open for business | 94.80% |  |  |  |
Percentage of rent collections | 84.30% |  |  |  |
Rent abatements | $ 783 |  |  |  |
Fund IV Property |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Impairment charge of right-of-use asset |  |  |  |  | $ 12,300
BSP II |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Number of operating lease | item |  |  | 1 |  |
Branch Plaza |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Number of operating lease | item |  |  |  |  | 1
Operating Lease term |  |  |  |  | 22 years
1238 Wisconsin |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease right-of-use asset |  |  |  |  | $ 1,900
Operating lease liability |  |  |  |  | 1,900
Lease agreement purchase price |  |  |  |  | $ 11,500
Accounting Standards Update 2016-02 | 991 Madison Avenue Manhattan, NY |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Capital lease term |  |  | 49 years |  |
Operating Lease term |  |  | 15 years |  |
Rye Corporate Office Lease |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease right-of-use asset | 400 |  |  |  |
Operating lease liability | $ 400 |  |  |  |
Office Lease |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease right-of-use asset |  | $ 1,700 |  |  |
Number of operating lease | item |  | 1 |  |  |
Lease liability - operating lease |  | $ 1,700 |  |  |
Minimum |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease term | 1 month |  |  |  |
Maximum |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease term | 60 years |  |  |  |

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