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Related Party Arrangements - Issuance of Common Stock to the Advisor (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]            
Share-based payment of advisor asset management fees (in shares)         800,000  
Share-based payment of advisor asset management fees $ 2,500 $ 2,500 $ 2,500 $ 2,500 $ 5,000  
Common stock (in shares) 189,620,662       189,620,662 189,111,561
Common stock $ 1,896       $ 1,896 $ 1,891
The Advisor, the Sponsor, and affiliates            
Related Party Transaction [Line Items]            
Common stock (in shares) 3,900,000       3,900,000  
Common stock $ 24,400       $ 24,400  
Common stock, outstanding (percentage) 1.70%       1.70%