Related Party Transactions - Fees Earned/Expenses Incurred and Amounts Payable to Related Parties (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Due from related parties	$ 1		$ 1		$ 297
Due to related parties	1,434		1,434		432
RAI | Self Insurance Funds Held
Related Party Transaction [Line Items]
Due from related parties					33
RAI | Operating Expense Reimbursements
Related Party Transaction [Line Items]
Due from related parties					264
Property | Green Trails
Related Party Transaction [Line Items]
Due from related parties	1		1
Property | Meridian
Related Party Transaction [Line Items]
Due to related parties					2
Advisor | Operating Expense Reimbursements
Related Party Transaction [Line Items]
Due to related parties	1,111		1,111		6
Fees earned / expenses incurred	845	$ 834	2,920	$ 2,682
Advisor | Internal Audit
Related Party Transaction [Line Items]
Due to related parties	7		7
Fees earned / expenses incurred	27		79
Advisor | Asset Management Fees
Related Party Transaction [Line Items]
Fees earned / expenses incurred	2,303	2,321	6,777	7,054
Advisor | Debt Financing Fees
Related Party Transaction [Line Items]
Fees earned / expenses incurred				39
Advisor | Disposition Fees
Related Party Transaction [Line Items]
Fees earned / expenses incurred				274
Manager | Operating Expense Reimbursements
Related Party Transaction [Line Items]
Due to related parties					96
Fees earned / expenses incurred				70
Manager | Property Management Fees
Related Party Transaction [Line Items]
Due to related parties	316		316		$ 328
Fees earned / expenses incurred	$ 952	1,003	2,847	2,910
Manager | Construction Management Fees
Related Party Transaction [Line Items]
Fees earned / expenses incurred		37	$ 103	150
Manager | Construction Payroll Reimbursements
Related Party Transaction [Line Items]
Fees earned / expenses incurred		$ 7		$ 61