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%