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 |