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Related Party Arrangements - Issuance of Common Stock to the Advisor (Narrative) (Details)
shares in Thousands, $ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
shares
Related Party Transaction [Line Items]  
Issuance of common stock as payment for asset management fees | $ $ 7.5
Common Stock  
Related Party Transaction [Line Items]  
Share-based payment of advisor asset management fees (in shares) | shares 882