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Related Party Arrangements - Issuance of Common Stock to the Advisor (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Related Party Transaction [Line Items]      
Share-based payment of advisor asset management fees (in shares) 400,000    
Share-based payment of advisor asset management fees $ 2,500 $ 2,500  
Common stock (in shares) 189,191,862   189,111,561
Common stock $ 1,892   $ 1,891
The Advisor, the Sponsor, and affiliates      
Related Party Transaction [Line Items]      
Common stock (in shares) 3,500,000    
Common stock $ 21,900    
Common stock, outstanding (percentage) 1.50%