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Impact of COVID-19 - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Aug. 05, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Subsequent Event [Line Items] |  |  |  |  |
Rental revenue |  | $ 52,002 | $ 55,953 | $ 107,418 | $ 112,756
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Rent deferral period | 3 months |  |  |  |
Contractual Base Rent, Operating Expense And Real Estate Recoveries Collected [Member] | Revenue | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Percentage of total revenue | 80.00% |  |  |  |
Contractual base rent, operating expense and real estate tax recoveries not collected due to COVID-19 | Revenue | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Percentage of total revenue | 20.00% |  |  |  |
Operating lease income subject to deferral agreements | Outstanding Billings | Revenue | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Percentage of total revenue | 8.00% |  |  |  |
Operating lease income subject to deferral agreements | April, May, June 2020 unpaid balance as percent of total unpaid balance | Revenue | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Percentage of total revenue | 37.00% |  |  |  |
Operating lease income subject to deferral agreements, anchor or national tenants | Outstanding Billings | Revenue | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Percentage of total revenue | 17.00% |  |  |  |
COVID-19 | Operating lease income subject to deferral agreements | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Rental revenue | $ 3,900 |  |  |  |
Retail Real Estate | Contractual Base Rent, Operating Expense And Real Estate Recoveries Collected [Member] | Revenue | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Percentage of total revenue | 74.00% |  |  |  |
Office Real Estate | Contractual Base Rent, Operating Expense And Real Estate Recoveries Collected [Member] | Revenue | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Percentage of total revenue | 94.00% |  |  |  |
Residential Real Estate | Contractual Base Rent, Operating Expense And Real Estate Recoveries Collected [Member] | Revenue | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Percentage of total revenue | 100.00% |  |  |  |
April 2020 | Contractual Base Rent, Operating Expense And Real Estate Recoveries Collected [Member] | Revenue | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Percentage of total revenue | 82.00% |  |  |  |
May 2020 | Contractual Base Rent, Operating Expense And Real Estate Recoveries Collected [Member] | Revenue | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Percentage of total revenue | 78.00% |  |  |  |
June 2020 | Contractual Base Rent, Operating Expense And Real Estate Recoveries Collected [Member] | Revenue | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Percentage of total revenue | 79.00% |  |  |  |

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