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Related Party Arrangements - Dealer Manager (Narrative) (Details) - Maximum - Dealer Manager - Selling Commissions Or Dealer Manager Fees
3 Months Ended
Mar. 31, 2018
USD ($)
Related Party Transaction [Line Items]  
Selling commissions as a percentage of gross offering proceeds from the primary offering 7.00%
Dealer manager fee as a percentage of gross offering proceeds from the primary offering 3.00%
Selling commissions or dealer manager fees paid for sales pursuant to distribution reinvestment plan $ 0