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Impact of COVID-19 - Narrative (Details) $ in Thousands | 3 Months Ended | 4 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Jun. 30, 2020 | Sep. 30, 2019 USD ($) | Oct. 31, 2020 | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |
Rental revenue | $ 55,749 |  | $ 55,487 |  | $ 163,167 | $ 168,242
Rent deferral period | 3 months | 3 months |  |  |  |
Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Deferred Rent, Percent Due |  |  |  | 0.03 |  |
Contractual Base Rent, Operating Expense And Real Estate Recoveries Collected | Revenue |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Percentage of total revenue | 91.00% | 83.00% |  |  |  |
Operating lease income subject to deferral agreements | Outstanding Billings | Revenue |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Percentage of total revenue | 2.00% | 11.00% |  |  |  |
Operating lease income subject to deferral agreements | April, May, June 2020 unpaid balance as percent of total unpaid balance | Revenue |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Percentage of total revenue | 24.00% | 67.00% |  |  |  |
Operating lease income subject to deferral agreements, anchor or national tenants | Outstanding Billings | Revenue |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Percentage of total revenue | 1.00% | 4.00% |  |  |  |
Retail Real Estate | Contractual Base Rent, Operating Expense And Real Estate Recoveries Collected | Revenue |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Percentage of total revenue | 89.00% | 79.00% |  |  |  |
Office Real Estate | Contractual Base Rent, Operating Expense And Real Estate Recoveries Collected | Revenue |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Percentage of total revenue | 95.00% | 95.00% |  |  |  |
Residential Real Estate | Contractual Base Rent, Operating Expense And Real Estate Recoveries Collected | Revenue |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Percentage of total revenue | 100.00% | 100.00% |  |  |  |

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