Rental Property - Loss on Impairments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) building	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($) building
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Number of Buildings Impaired | building	1			6
Fair Value Inputs Exit Capitalization Rate	10.00%
Fair Value Inputs, Discount Rates	10.50%
Fair Value, Nonrecurring
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Property, Plant, and Equipment, Fair Value Disclosure	$ 5,019		$ 5,019
Operating Income (Loss) [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Impairment of Real Estate	$ 3,172	$ 4,400	$ 3,172	$ 9,800