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Related Party Arrangements - Reimbursements to Advisor (Narrative) (Details) - Advisor - Operating Costs
12 Months Ended
Dec. 31, 2020
USD ($)
quarter
Related Party Transaction [Line Items]  
Reimbursement of personnel costs related to executive officers and other personnel involved in activities for which the Advisor receives an acquisition fee or disposition fee | $ $ 0
Number of preceding fiscal quarters | quarter 4
Percentage of average invested assets reimbursable as operating costs 2.00%
Expense reimbursement period (months) 12 months
Maximum  
Related Party Transaction [Line Items]  
Percentage of net income, without reduction for any additions to reserves for depreciation, loan losses or other similar non-cash reserves and excluding any gain from the sale of the company's assets 25.00%